mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 10:56:12 +01:00
6536 lines
233 KiB
Text
6536 lines
233 KiB
Text
ALTER DATABASE test CHARACTER SET latin1 COLLATE latin1_swedish_ci;
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DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
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DROP DATABASE IF EXISTS world;
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set @org_optimizer_switch=@@optimizer_switch;
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set @save_join_cache_level=@@join_cache_level;
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set @save_join_buffer_space_limit=@@join_buffer_space_limit;
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set @save_join_buffer_size=@@join_buffer_size;
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set @save_expensive_subquery_limit=@@expensive_subquery_limit;
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set @@optimizer_switch='optimize_join_buffer_size=on';
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set @@optimizer_switch='semijoin=on,firstmatch=on,loosescan=on';
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set @@optimizer_switch='semijoin_with_cache=on';
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set @@optimizer_switch='outer_join_with_cache=on';
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set @@optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
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set @local_optimizer_switch=@@optimizer_switch;
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set @innodb_stats_persistent_save= @@innodb_stats_persistent;
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set @innodb_stats_persistent_sample_pages_save=
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@@innodb_stats_persistent_sample_pages;
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set global innodb_stats_persistent= 1;
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set global innodb_stats_persistent_sample_pages=100;
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set names utf8;
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CREATE DATABASE world CHARACTER SET latin1;
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use world;
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CREATE TABLE Country (
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Code char(3) NOT NULL default '',
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Name char(52) NOT NULL default '',
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SurfaceArea float(10,2) NOT NULL default '0.00',
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Population int(11) NOT NULL default '0',
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Capital int(11) default NULL
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);
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CREATE TABLE City (
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ID int(11) NOT NULL,
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Name char(35) NOT NULL default '',
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Country char(3) NOT NULL default '',
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Population int(11) NOT NULL default '0'
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);
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CREATE TABLE CountryLanguage (
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Country char(3) NOT NULL default '',
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Language char(30) NOT NULL default '',
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Percentage float(3,1) NOT NULL default '0.0'
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);
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SELECT COUNT(*) FROM Country;
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COUNT(*)
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239
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SELECT COUNT(*) FROM City;
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COUNT(*)
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4079
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SELECT COUNT(*) FROM CountryLanguage;
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COUNT(*)
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984
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show variables like 'join_buffer_size';
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Variable_name Value
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join_buffer_size 262144
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set join_cache_level=1;
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show variables like 'join_cache_level';
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Variable_name Value
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join_cache_level 1
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# Query 1
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EXPLAIN
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
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# Query 2
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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Name Name
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?iauliai Lithuania
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Beirut Lebanon
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Bengasi Libyan Arab Jamahiriya
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Daugavpils Latvia
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Kaunas Lithuania
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Klaipeda Lithuania
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Maseru Lesotho
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Misrata Libyan Arab Jamahiriya
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Monrovia Liberia
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Panevezys Lithuania
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Riga Latvia
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Tripoli Lebanon
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Tripoli Libyan Arab Jamahiriya
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Vientiane Laos
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Vilnius Lithuania
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# Query 3
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EXPLAIN
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
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# Query 4
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
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Name Name Language
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La Matanza Argentina Spanish
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Lagos de Moreno Mexico Spanish
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Lalitapur Nepal Nepali
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Las Margaritas Mexico Spanish
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Las Palmas de Gran Canaria Spain Spanish
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Lashio (Lasho) Myanmar Burmese
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Lauro de Freitas Brazil Portuguese
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Lengshuijiang China Chinese
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Leninsk-Kuznetski Russian Federation Russian
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Leverkusen Germany German
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Lexington-Fayette United States English
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Liangcheng China Chinese
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Lianyungang China Chinese
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Little Rock United States English
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Liupanshui China Chinese
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Lleida (Lérida) Spain Spanish
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Lomas de Zamora Argentina Spanish
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Long Beach United States English
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Los Angeles Chile Spanish
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Los Angeles United States English
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Los Teques Venezuela Spanish
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Louisville United States English
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Lower Hutt New Zealand English
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Luchou Taiwan Min
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Ludwigshafen am Rhein Germany German
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Lungtan Taiwan Min
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L´Hospitalet de Llobregat Spain Spanish
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Lázaro Cárdenas Mexico Spanish
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set join_cache_level=2;
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show variables like 'join_cache_level';
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Variable_name Value
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join_cache_level 2
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# join_cache_level 2, Query 1
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EXPLAIN
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
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# join_cache_level 2, Query 2
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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Name Name
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?iauliai Lithuania
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Beirut Lebanon
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Bengasi Libyan Arab Jamahiriya
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Daugavpils Latvia
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Kaunas Lithuania
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Klaipeda Lithuania
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Maseru Lesotho
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Misrata Libyan Arab Jamahiriya
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Monrovia Liberia
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Panevezys Lithuania
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Riga Latvia
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Tripoli Lebanon
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Tripoli Libyan Arab Jamahiriya
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Vientiane Laos
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Vilnius Lithuania
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# join_cache_level 2, Query 3
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EXPLAIN
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join)
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# join_cache_level 2, Query 4
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
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Name Name Language
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La Matanza Argentina Spanish
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Lagos de Moreno Mexico Spanish
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Lalitapur Nepal Nepali
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Las Margaritas Mexico Spanish
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Las Palmas de Gran Canaria Spain Spanish
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Lashio (Lasho) Myanmar Burmese
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Lauro de Freitas Brazil Portuguese
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Lengshuijiang China Chinese
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Leninsk-Kuznetski Russian Federation Russian
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Leverkusen Germany German
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Lexington-Fayette United States English
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Liangcheng China Chinese
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Lianyungang China Chinese
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Little Rock United States English
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Liupanshui China Chinese
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Lleida (Lérida) Spain Spanish
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Lomas de Zamora Argentina Spanish
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Long Beach United States English
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Los Angeles Chile Spanish
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Los Angeles United States English
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Los Teques Venezuela Spanish
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Louisville United States English
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Lower Hutt New Zealand English
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Luchou Taiwan Min
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Ludwigshafen am Rhein Germany German
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Lungtan Taiwan Min
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L´Hospitalet de Llobregat Spain Spanish
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Lázaro Cárdenas Mexico Spanish
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set join_cache_level=3;
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show variables like 'join_cache_level';
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Variable_name Value
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join_cache_level 3
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# join_cache_level 3, Query 1
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EXPLAIN
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
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# join_cache_level 3, Query 2
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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Name Name
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?iauliai Lithuania
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Beirut Lebanon
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Bengasi Libyan Arab Jamahiriya
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Daugavpils Latvia
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Kaunas Lithuania
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Klaipeda Lithuania
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Maseru Lesotho
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Misrata Libyan Arab Jamahiriya
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Monrovia Liberia
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Panevezys Lithuania
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Riga Latvia
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Tripoli Lebanon
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Tripoli Libyan Arab Jamahiriya
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Vientiane Laos
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Vilnius Lithuania
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# join_cache_level 3, Query 3
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EXPLAIN
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
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1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
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# join_cache_level 3, Query 4
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
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Name Name Language
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La Matanza Argentina Spanish
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Lagos de Moreno Mexico Spanish
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Lalitapur Nepal Nepali
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Las Margaritas Mexico Spanish
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||
Las Palmas de Gran Canaria Spain Spanish
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Lashio (Lasho) Myanmar Burmese
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||
Lauro de Freitas Brazil Portuguese
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||
Lengshuijiang China Chinese
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||
Leninsk-Kuznetski Russian Federation Russian
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||
Leverkusen Germany German
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||
Lexington-Fayette United States English
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||
Liangcheng China Chinese
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||
Lianyungang China Chinese
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||
Little Rock United States English
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||
Liupanshui China Chinese
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||
Lleida (Lérida) Spain Spanish
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||
Lomas de Zamora Argentina Spanish
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||
Long Beach United States English
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||
Los Angeles Chile Spanish
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||
Los Angeles United States English
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||
Los Teques Venezuela Spanish
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||
Louisville United States English
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||
Lower Hutt New Zealand English
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||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
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||
Lungtan Taiwan Min
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||
L´Hospitalet de Llobregat Spain Spanish
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Lázaro Cárdenas Mexico Spanish
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set join_cache_level=4;
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show variables like 'join_cache_level';
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Variable_name Value
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join_cache_level 4
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# join_cache_level 4, Query 1
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EXPLAIN
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
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# join_cache_level 4, Query 2
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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Name Name
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?iauliai Lithuania
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Beirut Lebanon
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Bengasi Libyan Arab Jamahiriya
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||
Daugavpils Latvia
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||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
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Tripoli Lebanon
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Tripoli Libyan Arab Jamahiriya
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Vientiane Laos
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Vilnius Lithuania
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# join_cache_level 4, Query 3
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EXPLAIN
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50 AND
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LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
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1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join)
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# join_cache_level 4, Query 4
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
|
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
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LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
# join_cache_level 4, Query 5
|
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SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND City.Population > 5000000
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
Name Population Name Population
|
||
China 1277558000 Shanghai 9696300
|
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China 1277558000 Peking 7472000
|
||
China 1277558000 Chongqing 6351600
|
||
China 1277558000 Tianjin 5286800
|
||
Colombia 42321000 Santafé de Bogotá 6260862
|
||
Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
|
||
Chile 15211000 NULL NULL
|
||
Cambodia 11168000 NULL NULL
|
||
Cameroon 15085000 NULL NULL
|
||
Canada 31147000 NULL NULL
|
||
Cuba 11201000 NULL NULL
|
||
Côte d?Ivoire 14786000 NULL NULL
|
||
Czech Republic 10278100 NULL NULL
|
||
# join_cache_level 4, Query 6
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND
|
||
(City.Population > 5000000 OR City.Name LIKE 'Za%')
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
Name Population Name Population
|
||
China 1277558000 Shanghai 9696300
|
||
China 1277558000 Peking 7472000
|
||
China 1277558000 Chongqing 6351600
|
||
China 1277558000 Tianjin 5286800
|
||
China 1277558000 Zaozhuang 380846
|
||
China 1277558000 Zaoyang 162198
|
||
China 1277558000 Zalantun 130031
|
||
Colombia 42321000 Santafé de Bogotá 6260862
|
||
Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
|
||
Chile 15211000 NULL NULL
|
||
Cambodia 11168000 NULL NULL
|
||
Cameroon 15085000 NULL NULL
|
||
Canada 31147000 NULL NULL
|
||
Cuba 11201000 NULL NULL
|
||
Côte d?Ivoire 14786000 NULL NULL
|
||
Czech Republic 10278100 NULL NULL
|
||
CREATE INDEX City_Population ON City(Population);
|
||
CREATE INDEX City_Name ON City(Name);
|
||
ANALYZE TABLE City;
|
||
# After Analyze, Query 1
|
||
EXPLAIN
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND City.Population > 5000000
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE City hash_range City_Population #hash#$hj:City_Population 3:4 world.Country.Code 24 Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
|
||
# After Analyze, Query 2
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND City.Population > 5000000
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
Name Population Name Population
|
||
China 1277558000 Shanghai 9696300
|
||
China 1277558000 Peking 7472000
|
||
China 1277558000 Chongqing 6351600
|
||
China 1277558000 Tianjin 5286800
|
||
Colombia 42321000 Santafé de Bogotá 6260862
|
||
Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
|
||
Chile 15211000 NULL NULL
|
||
Cambodia 11168000 NULL NULL
|
||
Cameroon 15085000 NULL NULL
|
||
Canada 31147000 NULL NULL
|
||
Cuba 11201000 NULL NULL
|
||
Côte d?Ivoire 14786000 NULL NULL
|
||
Czech Republic 10278100 NULL NULL
|
||
# After Analyze, Query 3
|
||
EXPLAIN
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND
|
||
(City.Population > 5000000 OR City.Name LIKE 'Za%')
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE City hash_index_merge City_Population,City_Name #hash#$hj:City_Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(City_Population,City_Name); Using where; Using join buffer (flat, BNLH join)
|
||
# After Analyze, Query 4
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND
|
||
(City.Population > 5000000 OR City.Name LIKE 'Za%')
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
Name Population Name Population
|
||
China 1277558000 Shanghai 9696300
|
||
China 1277558000 Peking 7472000
|
||
China 1277558000 Chongqing 6351600
|
||
China 1277558000 Tianjin 5286800
|
||
China 1277558000 Zaozhuang 380846
|
||
China 1277558000 Zaoyang 162198
|
||
China 1277558000 Zalantun 130031
|
||
Colombia 42321000 Santafé de Bogotá 6260862
|
||
Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
|
||
Chile 15211000 NULL NULL
|
||
Cambodia 11168000 NULL NULL
|
||
Cameroon 15085000 NULL NULL
|
||
Canada 31147000 NULL NULL
|
||
Cuba 11201000 NULL NULL
|
||
Côte d?Ivoire 14786000 NULL NULL
|
||
Czech Republic 10278100 NULL NULL
|
||
DROP INDEX City_Population ON City;
|
||
DROP INDEX City_Name ON City;
|
||
set join_cache_level=1;
|
||
set join_buffer_size=256;
|
||
show variables like 'join_buffer_size';
|
||
Variable_name Value
|
||
join_buffer_size 256
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 1
|
||
# join_cache_level 1, Join_buffer_size, Query 1
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
|
||
# join_cache_level 1, Join_buffer_size, Query 2
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
# join_cache_level 1, Join_buffer_size, Query 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
|
||
# join_cache_level 1, Join_buffer_size, Query 4
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
set join_cache_level=2;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 2
|
||
# join_cache_level 2, Join_buffer_size, Query 1
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
|
||
# join_cache_level 2, Join_buffer_size, Query 2
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
# join_cache_level 2, Join_buffer_size, Query 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join)
|
||
# join_cache_level 2, Join_buffer_size, Query 4
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
set join_cache_level=3;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 3
|
||
# join_cache_level 3, Join_buffer_size, Query 1
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# join_cache_level 3, Join_buffer_size, Query 2
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
# join_cache_level 3, Join_buffer_size, Query 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# join_cache_level 3, Join_buffer_size, Query 4
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
set join_cache_level=4;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 4
|
||
# join_cache_level 4, Join_buffer_size, Query 1
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# join_cache_level 4, Join_buffer_size, Query 2
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
# join_cache_level 4, Join_buffer_size, Query 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join)
|
||
# join_cache_level 4, Join_buffer_size, Query 4
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
set join_cache_level=@save_join_cache_level;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
DROP DATABASE world;
|
||
CREATE DATABASE world CHARACTER SET latin1;
|
||
use world;
|
||
CREATE TABLE Country (
|
||
Code char(3) NOT NULL default '',
|
||
Name char(52) NOT NULL default '',
|
||
SurfaceArea float(10,2) NOT NULL default '0.00',
|
||
Population int(11) NOT NULL default '0',
|
||
Capital int(11) default NULL,
|
||
PRIMARY KEY (Code),
|
||
UNIQUE INDEX (Name)
|
||
);
|
||
CREATE TABLE City (
|
||
ID int(11) NOT NULL auto_increment,
|
||
Name char(35) NOT NULL default '',
|
||
Country char(3) NOT NULL default '',
|
||
Population int(11) NOT NULL default '0',
|
||
PRIMARY KEY (ID),
|
||
INDEX (Population),
|
||
INDEX (Country)
|
||
);
|
||
CREATE TABLE CountryLanguage (
|
||
Country char(3) NOT NULL default '',
|
||
Language char(30) NOT NULL default '',
|
||
Percentage float(3,1) NOT NULL default '0.0',
|
||
PRIMARY KEY (Country, Language),
|
||
INDEX (Percentage)
|
||
);
|
||
show variables like 'join_buffer_size';
|
||
Variable_name Value
|
||
join_buffer_size 262144
|
||
set join_cache_level=3;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 3
|
||
# Part 2, join_cache_level=3, Query 1
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=3, Query 2
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
# Part 2, join_cache_level=3, Query 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (flat, BNLH join); Using rowid filter
|
||
# Part 2, join_cache_level=3, Query 4
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
# Part 2, join_cache_level=3, Query 5
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=3, Query 6
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
# Part 2, join_cache_level=3, Query 7
|
||
EXPLAIN
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage hash_ALL PRIMARY #hash#PRIMARY 33 world.Country.Code,const 984 Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=3, Query 8
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
Name epx
|
||
Australia 81.2
|
||
United Kingdom 97.3
|
||
Canada 60.4
|
||
United States 86.2
|
||
Zimbabwe 2.2
|
||
Japan 0.1
|
||
South Africa 8.5
|
||
Malaysia 1.6
|
||
Afghanistan NULL
|
||
Netherlands NULL
|
||
Algeria NULL
|
||
Angola NULL
|
||
Argentina NULL
|
||
Bangladesh NULL
|
||
Belgium NULL
|
||
Brazil NULL
|
||
Burkina Faso NULL
|
||
Chile NULL
|
||
Ecuador NULL
|
||
Egypt NULL
|
||
Spain NULL
|
||
Ethiopia NULL
|
||
Philippines NULL
|
||
Ghana NULL
|
||
Guatemala NULL
|
||
Indonesia NULL
|
||
India NULL
|
||
Iraq NULL
|
||
Iran NULL
|
||
Italy NULL
|
||
Yemen NULL
|
||
Yugoslavia NULL
|
||
Cambodia NULL
|
||
Cameroon NULL
|
||
Kazakstan NULL
|
||
Kenya NULL
|
||
China NULL
|
||
Colombia NULL
|
||
Congo, The Democratic Republic of the NULL
|
||
North Korea NULL
|
||
South Korea NULL
|
||
Greece NULL
|
||
Cuba NULL
|
||
Madagascar NULL
|
||
Malawi NULL
|
||
Mali NULL
|
||
Morocco NULL
|
||
Mexico NULL
|
||
Mozambique NULL
|
||
Myanmar NULL
|
||
Nepal NULL
|
||
Niger NULL
|
||
Nigeria NULL
|
||
Côte d?Ivoire NULL
|
||
Pakistan NULL
|
||
Peru NULL
|
||
Poland NULL
|
||
France NULL
|
||
Romania NULL
|
||
Germany NULL
|
||
Saudi Arabia NULL
|
||
Somalia NULL
|
||
Sri Lanka NULL
|
||
Sudan NULL
|
||
Syria NULL
|
||
Taiwan NULL
|
||
Tanzania NULL
|
||
Thailand NULL
|
||
Czech Republic NULL
|
||
Türkiye NULL
|
||
Uganda NULL
|
||
Ukraine NULL
|
||
Hungary NULL
|
||
Uzbekistan NULL
|
||
Belarus NULL
|
||
Venezuela NULL
|
||
Russian Federation NULL
|
||
Vietnam NULL
|
||
show variables like 'join_buffer_size';
|
||
Variable_name Value
|
||
join_buffer_size 262144
|
||
set join_cache_level=4;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 4
|
||
# Part 2, join_cache_level=4, Query 1
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=4, Query 2
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
# Part 2, join_cache_level=4, Query 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (incremental, BNLH join); Using rowid filter
|
||
# Part 2, join_cache_level=4, Query 4
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
# Part 2, join_cache_level=4, Query 5
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=4, Query 6
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
# Part 2, join_cache_level=4, Query 7
|
||
EXPLAIN
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage hash_ALL PRIMARY #hash#PRIMARY 33 world.Country.Code,const 984 Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=4, Query 8
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
Name epx
|
||
Australia 81.2
|
||
United Kingdom 97.3
|
||
Canada 60.4
|
||
United States 86.2
|
||
Zimbabwe 2.2
|
||
Japan 0.1
|
||
South Africa 8.5
|
||
Malaysia 1.6
|
||
Afghanistan NULL
|
||
Netherlands NULL
|
||
Algeria NULL
|
||
Angola NULL
|
||
Argentina NULL
|
||
Bangladesh NULL
|
||
Belgium NULL
|
||
Brazil NULL
|
||
Burkina Faso NULL
|
||
Chile NULL
|
||
Ecuador NULL
|
||
Egypt NULL
|
||
Spain NULL
|
||
Ethiopia NULL
|
||
Philippines NULL
|
||
Ghana NULL
|
||
Guatemala NULL
|
||
Indonesia NULL
|
||
India NULL
|
||
Iraq NULL
|
||
Iran NULL
|
||
Italy NULL
|
||
Yemen NULL
|
||
Yugoslavia NULL
|
||
Cambodia NULL
|
||
Cameroon NULL
|
||
Kazakstan NULL
|
||
Kenya NULL
|
||
China NULL
|
||
Colombia NULL
|
||
Congo, The Democratic Republic of the NULL
|
||
North Korea NULL
|
||
South Korea NULL
|
||
Greece NULL
|
||
Cuba NULL
|
||
Madagascar NULL
|
||
Malawi NULL
|
||
Mali NULL
|
||
Morocco NULL
|
||
Mexico NULL
|
||
Mozambique NULL
|
||
Myanmar NULL
|
||
Nepal NULL
|
||
Niger NULL
|
||
Nigeria NULL
|
||
Côte d?Ivoire NULL
|
||
Pakistan NULL
|
||
Peru NULL
|
||
Poland NULL
|
||
France NULL
|
||
Romania NULL
|
||
Germany NULL
|
||
Saudi Arabia NULL
|
||
Somalia NULL
|
||
Sri Lanka NULL
|
||
Sudan NULL
|
||
Syria NULL
|
||
Taiwan NULL
|
||
Tanzania NULL
|
||
Thailand NULL
|
||
Czech Republic NULL
|
||
Türkiye NULL
|
||
Uganda NULL
|
||
Ukraine NULL
|
||
Hungary NULL
|
||
Uzbekistan NULL
|
||
Belarus NULL
|
||
Venezuela NULL
|
||
Russian Federation NULL
|
||
Vietnam NULL
|
||
# Part 2, join_cache_level=4, Query 9
|
||
EXPLAIN
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND City.Population > 5000000
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range Name Name 52 NULL # Using index condition; Using where; Rowid-ordered scan
|
||
1 SIMPLE City hash_range Population,Country #hash#Country:Population 3:4 world.Country.Code # Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=4, Query 10
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND City.Population > 5000000
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
Name Population Name Population
|
||
China 1277558000 Shanghai 9696300
|
||
China 1277558000 Peking 7472000
|
||
China 1277558000 Chongqing 6351600
|
||
China 1277558000 Tianjin 5286800
|
||
Colombia 42321000 Santafé de Bogotá 6260862
|
||
Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
|
||
Chile 15211000 NULL NULL
|
||
Cambodia 11168000 NULL NULL
|
||
Cameroon 15085000 NULL NULL
|
||
Canada 31147000 NULL NULL
|
||
Cuba 11201000 NULL NULL
|
||
Côte d?Ivoire 14786000 NULL NULL
|
||
Czech Republic 10278100 NULL NULL
|
||
CREATE INDEX City_Name ON City(Name);
|
||
# Part 2, join_cache_level=4, City_Name, Query 1
|
||
EXPLAIN
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND
|
||
(City.Population > 5000000 OR City.Name LIKE 'Za%')
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range Name Name 52 NULL 17 Using index condition; Using where; Rowid-ordered scan
|
||
1 SIMPLE City hash_index_merge Population,Country,City_Name #hash#Country:Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(Population,City_Name); Using where; Using join buffer (flat, BNLH join)
|
||
# Part 2, join_cache_level=4, City_Name, Query 2
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND
|
||
(City.Population > 5000000 OR City.Name LIKE 'Za%')
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
Name Population Name Population
|
||
China 1277558000 Shanghai 9696300
|
||
China 1277558000 Peking 7472000
|
||
China 1277558000 Chongqing 6351600
|
||
China 1277558000 Tianjin 5286800
|
||
China 1277558000 Zaozhuang 380846
|
||
China 1277558000 Zaoyang 162198
|
||
China 1277558000 Zalantun 130031
|
||
Colombia 42321000 Santafé de Bogotá 6260862
|
||
Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
|
||
Chile 15211000 NULL NULL
|
||
Cambodia 11168000 NULL NULL
|
||
Cameroon 15085000 NULL NULL
|
||
Canada 31147000 NULL NULL
|
||
Cuba 11201000 NULL NULL
|
||
Côte d?Ivoire 14786000 NULL NULL
|
||
Czech Republic 10278100 NULL NULL
|
||
DROP INDEX City_Name ON City;
|
||
show variables like 'join_buffer_size';
|
||
Variable_name Value
|
||
join_buffer_size 262144
|
||
set join_cache_level=5;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 5
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
EXPLAIN
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
Name epx
|
||
Australia 81.2
|
||
United Kingdom 97.3
|
||
Canada 60.4
|
||
United States 86.2
|
||
Zimbabwe 2.2
|
||
Japan 0.1
|
||
South Africa 8.5
|
||
Malaysia 1.6
|
||
Afghanistan NULL
|
||
Netherlands NULL
|
||
Algeria NULL
|
||
Angola NULL
|
||
Argentina NULL
|
||
Bangladesh NULL
|
||
Belgium NULL
|
||
Brazil NULL
|
||
Burkina Faso NULL
|
||
Chile NULL
|
||
Ecuador NULL
|
||
Egypt NULL
|
||
Spain NULL
|
||
Ethiopia NULL
|
||
Philippines NULL
|
||
Ghana NULL
|
||
Guatemala NULL
|
||
Indonesia NULL
|
||
India NULL
|
||
Iraq NULL
|
||
Iran NULL
|
||
Italy NULL
|
||
Yemen NULL
|
||
Yugoslavia NULL
|
||
Cambodia NULL
|
||
Cameroon NULL
|
||
Kazakstan NULL
|
||
Kenya NULL
|
||
China NULL
|
||
Colombia NULL
|
||
Congo, The Democratic Republic of the NULL
|
||
North Korea NULL
|
||
South Korea NULL
|
||
Greece NULL
|
||
Cuba NULL
|
||
Madagascar NULL
|
||
Malawi NULL
|
||
Mali NULL
|
||
Morocco NULL
|
||
Mexico NULL
|
||
Mozambique NULL
|
||
Myanmar NULL
|
||
Nepal NULL
|
||
Niger NULL
|
||
Nigeria NULL
|
||
Côte d?Ivoire NULL
|
||
Pakistan NULL
|
||
Peru NULL
|
||
Poland NULL
|
||
France NULL
|
||
Romania NULL
|
||
Germany NULL
|
||
Saudi Arabia NULL
|
||
Somalia NULL
|
||
Sri Lanka NULL
|
||
Sudan NULL
|
||
Syria NULL
|
||
Taiwan NULL
|
||
Tanzania NULL
|
||
Thailand NULL
|
||
Czech Republic NULL
|
||
Türkiye NULL
|
||
Uganda NULL
|
||
Ukraine NULL
|
||
Hungary NULL
|
||
Uzbekistan NULL
|
||
Belarus NULL
|
||
Venezuela NULL
|
||
Russian Federation NULL
|
||
Vietnam NULL
|
||
set join_cache_level=6;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 6
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
EXPLAIN
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
Name epx
|
||
Australia 81.2
|
||
United Kingdom 97.3
|
||
Canada 60.4
|
||
United States 86.2
|
||
Zimbabwe 2.2
|
||
Japan 0.1
|
||
South Africa 8.5
|
||
Malaysia 1.6
|
||
Afghanistan NULL
|
||
Netherlands NULL
|
||
Algeria NULL
|
||
Angola NULL
|
||
Argentina NULL
|
||
Bangladesh NULL
|
||
Belgium NULL
|
||
Brazil NULL
|
||
Burkina Faso NULL
|
||
Chile NULL
|
||
Ecuador NULL
|
||
Egypt NULL
|
||
Spain NULL
|
||
Ethiopia NULL
|
||
Philippines NULL
|
||
Ghana NULL
|
||
Guatemala NULL
|
||
Indonesia NULL
|
||
India NULL
|
||
Iraq NULL
|
||
Iran NULL
|
||
Italy NULL
|
||
Yemen NULL
|
||
Yugoslavia NULL
|
||
Cambodia NULL
|
||
Cameroon NULL
|
||
Kazakstan NULL
|
||
Kenya NULL
|
||
China NULL
|
||
Colombia NULL
|
||
Congo, The Democratic Republic of the NULL
|
||
North Korea NULL
|
||
South Korea NULL
|
||
Greece NULL
|
||
Cuba NULL
|
||
Madagascar NULL
|
||
Malawi NULL
|
||
Mali NULL
|
||
Morocco NULL
|
||
Mexico NULL
|
||
Mozambique NULL
|
||
Myanmar NULL
|
||
Nepal NULL
|
||
Niger NULL
|
||
Nigeria NULL
|
||
Côte d?Ivoire NULL
|
||
Pakistan NULL
|
||
Peru NULL
|
||
Poland NULL
|
||
France NULL
|
||
Romania NULL
|
||
Germany NULL
|
||
Saudi Arabia NULL
|
||
Somalia NULL
|
||
Sri Lanka NULL
|
||
Sudan NULL
|
||
Syria NULL
|
||
Taiwan NULL
|
||
Tanzania NULL
|
||
Thailand NULL
|
||
Czech Republic NULL
|
||
Türkiye NULL
|
||
Uganda NULL
|
||
Ukraine NULL
|
||
Hungary NULL
|
||
Uzbekistan NULL
|
||
Belarus NULL
|
||
Venezuela NULL
|
||
Russian Federation NULL
|
||
Vietnam NULL
|
||
set join_cache_level=7;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 7
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
EXPLAIN
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
Name epx
|
||
Australia 81.2
|
||
United Kingdom 97.3
|
||
Canada 60.4
|
||
United States 86.2
|
||
Zimbabwe 2.2
|
||
Japan 0.1
|
||
South Africa 8.5
|
||
Malaysia 1.6
|
||
Afghanistan NULL
|
||
Netherlands NULL
|
||
Algeria NULL
|
||
Angola NULL
|
||
Argentina NULL
|
||
Bangladesh NULL
|
||
Belgium NULL
|
||
Brazil NULL
|
||
Burkina Faso NULL
|
||
Chile NULL
|
||
Ecuador NULL
|
||
Egypt NULL
|
||
Spain NULL
|
||
Ethiopia NULL
|
||
Philippines NULL
|
||
Ghana NULL
|
||
Guatemala NULL
|
||
Indonesia NULL
|
||
India NULL
|
||
Iraq NULL
|
||
Iran NULL
|
||
Italy NULL
|
||
Yemen NULL
|
||
Yugoslavia NULL
|
||
Cambodia NULL
|
||
Cameroon NULL
|
||
Kazakstan NULL
|
||
Kenya NULL
|
||
China NULL
|
||
Colombia NULL
|
||
Congo, The Democratic Republic of the NULL
|
||
North Korea NULL
|
||
South Korea NULL
|
||
Greece NULL
|
||
Cuba NULL
|
||
Madagascar NULL
|
||
Malawi NULL
|
||
Mali NULL
|
||
Morocco NULL
|
||
Mexico NULL
|
||
Mozambique NULL
|
||
Myanmar NULL
|
||
Nepal NULL
|
||
Niger NULL
|
||
Nigeria NULL
|
||
Côte d?Ivoire NULL
|
||
Pakistan NULL
|
||
Peru NULL
|
||
Poland NULL
|
||
France NULL
|
||
Romania NULL
|
||
Germany NULL
|
||
Saudi Arabia NULL
|
||
Somalia NULL
|
||
Sri Lanka NULL
|
||
Sudan NULL
|
||
Syria NULL
|
||
Taiwan NULL
|
||
Tanzania NULL
|
||
Thailand NULL
|
||
Czech Republic NULL
|
||
Türkiye NULL
|
||
Uganda NULL
|
||
Ukraine NULL
|
||
Hungary NULL
|
||
Uzbekistan NULL
|
||
Belarus NULL
|
||
Venezuela NULL
|
||
Russian Federation NULL
|
||
Vietnam NULL
|
||
set join_cache_level=8;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 8
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
EXPLAIN
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
||
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) as epx
|
||
FROM Country LEFT JOIN CountryLanguage ON
|
||
(CountryLanguage.Country=Country.Code AND Language='English')
|
||
WHERE
|
||
Country.Population > 10000000;
|
||
Name epx
|
||
Australia 81.2
|
||
United Kingdom 97.3
|
||
Canada 60.4
|
||
United States 86.2
|
||
Zimbabwe 2.2
|
||
Japan 0.1
|
||
South Africa 8.5
|
||
Malaysia 1.6
|
||
Afghanistan NULL
|
||
Netherlands NULL
|
||
Algeria NULL
|
||
Angola NULL
|
||
Argentina NULL
|
||
Bangladesh NULL
|
||
Belgium NULL
|
||
Brazil NULL
|
||
Burkina Faso NULL
|
||
Chile NULL
|
||
Ecuador NULL
|
||
Egypt NULL
|
||
Spain NULL
|
||
Ethiopia NULL
|
||
Philippines NULL
|
||
Ghana NULL
|
||
Guatemala NULL
|
||
Indonesia NULL
|
||
India NULL
|
||
Iraq NULL
|
||
Iran NULL
|
||
Italy NULL
|
||
Yemen NULL
|
||
Yugoslavia NULL
|
||
Cambodia NULL
|
||
Cameroon NULL
|
||
Kazakstan NULL
|
||
Kenya NULL
|
||
China NULL
|
||
Colombia NULL
|
||
Congo, The Democratic Republic of the NULL
|
||
North Korea NULL
|
||
South Korea NULL
|
||
Greece NULL
|
||
Cuba NULL
|
||
Madagascar NULL
|
||
Malawi NULL
|
||
Mali NULL
|
||
Morocco NULL
|
||
Mexico NULL
|
||
Mozambique NULL
|
||
Myanmar NULL
|
||
Nepal NULL
|
||
Niger NULL
|
||
Nigeria NULL
|
||
Côte d?Ivoire NULL
|
||
Pakistan NULL
|
||
Peru NULL
|
||
Poland NULL
|
||
France NULL
|
||
Romania NULL
|
||
Germany NULL
|
||
Saudi Arabia NULL
|
||
Somalia NULL
|
||
Sri Lanka NULL
|
||
Sudan NULL
|
||
Syria NULL
|
||
Taiwan NULL
|
||
Tanzania NULL
|
||
Thailand NULL
|
||
Czech Republic NULL
|
||
Türkiye NULL
|
||
Uganda NULL
|
||
Ukraine NULL
|
||
Hungary NULL
|
||
Uzbekistan NULL
|
||
Belarus NULL
|
||
Venezuela NULL
|
||
Russian Federation NULL
|
||
Vietnam NULL
|
||
set join_buffer_size=256;
|
||
show variables like 'join_buffer_size';
|
||
Variable_name Value
|
||
join_buffer_size 256
|
||
set join_cache_level=3;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 3
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (flat, BNLH join); Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
set join_cache_level=4;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 4
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (incremental, BNLH join); Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
set join_cache_level=5;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 5
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
set join_cache_level=6;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 6
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
set join_cache_level=7;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 7
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
set join_cache_level=8;
|
||
show variables like 'join_cache_level';
|
||
Variable_name Value
|
||
join_cache_level 8
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
|
||
SELECT City.Name, Country.Name, CountryLanguage.Language
|
||
FROM City,Country,CountryLanguage
|
||
WHERE City.Country=Country.Code AND
|
||
CountryLanguage.Country=Country.Code AND
|
||
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
||
CountryLanguage.Percentage > 50 AND
|
||
LENGTH(Language) < LENGTH(City.Name) - 2;
|
||
Name Name Language
|
||
La Matanza Argentina Spanish
|
||
Lagos de Moreno Mexico Spanish
|
||
Lalitapur Nepal Nepali
|
||
Las Margaritas Mexico Spanish
|
||
Las Palmas de Gran Canaria Spain Spanish
|
||
Lashio (Lasho) Myanmar Burmese
|
||
Lauro de Freitas Brazil Portuguese
|
||
Lengshuijiang China Chinese
|
||
Leninsk-Kuznetski Russian Federation Russian
|
||
Leverkusen Germany German
|
||
Lexington-Fayette United States English
|
||
Liangcheng China Chinese
|
||
Lianyungang China Chinese
|
||
Little Rock United States English
|
||
Liupanshui China Chinese
|
||
Lleida (Lérida) Spain Spanish
|
||
Lomas de Zamora Argentina Spanish
|
||
Long Beach United States English
|
||
Los Angeles Chile Spanish
|
||
Los Angeles United States English
|
||
Los Teques Venezuela Spanish
|
||
Louisville United States English
|
||
Lower Hutt New Zealand English
|
||
Luchou Taiwan Min
|
||
Ludwigshafen am Rhein Germany German
|
||
Lungtan Taiwan Min
|
||
L´Hospitalet de Llobregat Spain Spanish
|
||
Lázaro Cárdenas Mexico Spanish
|
||
EXPLAIN
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
|
||
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT Name FROM City
|
||
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
||
City.Population > 100000;
|
||
Name
|
||
Vientiane
|
||
Riga
|
||
Daugavpils
|
||
Maseru
|
||
Beirut
|
||
Tripoli
|
||
Monrovia
|
||
Tripoli
|
||
Bengasi
|
||
Misrata
|
||
Vilnius
|
||
Kaunas
|
||
Klaipeda
|
||
?iauliai
|
||
Panevezys
|
||
set join_cache_level=@save_join_cache_level;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=1;
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND City.Population > 3000000;
|
||
Name Name
|
||
Alexandria Egypt
|
||
Ankara Türkiye
|
||
Baghdad Iraq
|
||
Bangkok Thailand
|
||
Berlin Germany
|
||
Cairo Egypt
|
||
Calcutta [Kolkata] India
|
||
Chengdu China
|
||
Chennai (Madras) India
|
||
Chongqing China
|
||
Ciudad de México Mexico
|
||
Delhi India
|
||
Dhaka Bangladesh
|
||
Harbin China
|
||
Ho Chi Minh City Vietnam
|
||
Istanbul Türkiye
|
||
Jakarta Indonesia
|
||
Jokohama [Yokohama] Japan
|
||
Kanton [Guangzhou] China
|
||
Karachi Pakistan
|
||
Kinshasa Congo, The Democratic Republic of the
|
||
Lahore Pakistan
|
||
Lima Peru
|
||
London United Kingdom
|
||
Los Angeles United States
|
||
Moscow Russian Federation
|
||
Mumbai (Bombay) India
|
||
New York United States
|
||
Peking China
|
||
Pusan South Korea
|
||
Rangoon (Yangon) Myanmar
|
||
Rio de Janeiro Brazil
|
||
Riyadh Saudi Arabia
|
||
Santafé de Bogotá Colombia
|
||
Santiago de Chile Chile
|
||
Seoul South Korea
|
||
Shanghai China
|
||
Shenyang China
|
||
Singapore Singapore
|
||
St Petersburg Russian Federation
|
||
Sydney Australia
|
||
São Paulo Brazil
|
||
Teheran Iran
|
||
Tianjin China
|
||
Tokyo Japan
|
||
Wuhan China
|
||
set join_cache_level=8;
|
||
set join_buffer_size=384;
|
||
EXPLAIN
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND City.Population > 3000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE City range Population,Country Population 4 NULL # Using index condition; Rowid-ordered scan
|
||
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country # Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND City.Population > 3000000;
|
||
Name Name
|
||
Alexandria Egypt
|
||
Ankara Türkiye
|
||
Baghdad Iraq
|
||
Bangkok Thailand
|
||
Berlin Germany
|
||
Cairo Egypt
|
||
Calcutta [Kolkata] India
|
||
Chengdu China
|
||
Chennai (Madras) India
|
||
Chongqing China
|
||
Ciudad de México Mexico
|
||
Delhi India
|
||
Dhaka Bangladesh
|
||
Harbin China
|
||
Ho Chi Minh City Vietnam
|
||
Istanbul Türkiye
|
||
Jakarta Indonesia
|
||
Jokohama [Yokohama] Japan
|
||
Kanton [Guangzhou] China
|
||
Karachi Pakistan
|
||
Kinshasa Congo, The Democratic Republic of the
|
||
Lahore Pakistan
|
||
Lima Peru
|
||
London United Kingdom
|
||
Los Angeles United States
|
||
Moscow Russian Federation
|
||
Mumbai (Bombay) India
|
||
New York United States
|
||
Peking China
|
||
Pusan South Korea
|
||
Rangoon (Yangon) Myanmar
|
||
Rio de Janeiro Brazil
|
||
Riyadh Saudi Arabia
|
||
Santafé de Bogotá Colombia
|
||
Santiago de Chile Chile
|
||
Seoul South Korea
|
||
Shanghai China
|
||
Shenyang China
|
||
Singapore Singapore
|
||
St Petersburg Russian Federation
|
||
Sydney Australia
|
||
São Paulo Brazil
|
||
Teheran Iran
|
||
Tianjin China
|
||
Tokyo Japan
|
||
Wuhan China
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=6;
|
||
ALTER TABLE Country MODIFY Name varchar(52) NOT NULL default '';
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
ALTER TABLE Country MODIFY Name varchar(300) NOT NULL default '';
|
||
SELECT City.Name, Country.Name FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name
|
||
?iauliai Lithuania
|
||
Beirut Lebanon
|
||
Bengasi Libyan Arab Jamahiriya
|
||
Daugavpils Latvia
|
||
Kaunas Lithuania
|
||
Klaipeda Lithuania
|
||
Maseru Lesotho
|
||
Misrata Libyan Arab Jamahiriya
|
||
Monrovia Liberia
|
||
Panevezys Lithuania
|
||
Riga Latvia
|
||
Tripoli Lebanon
|
||
Tripoli Libyan Arab Jamahiriya
|
||
Vientiane Laos
|
||
Vilnius Lithuania
|
||
ALTER TABLE Country ADD COLUMN PopulationBar text;
|
||
UPDATE Country
|
||
SET PopulationBar=REPEAT('x', CAST(Population/100000 AS unsigned int));
|
||
SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name PopulationBar
|
||
?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
||
Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx
|
||
Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
||
Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
set join_buffer_size=256;
|
||
SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
|
||
WHERE City.Country=Country.Code AND
|
||
Country.Name LIKE 'L%' AND City.Population > 100000;
|
||
Name Name PopulationBar
|
||
?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
||
Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx
|
||
Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
||
Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
||
set join_cache_level=@save_join_cache_level;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
#
|
||
# MDEV-17752: Plan changes from hash_index_merge to index_merge with new optimizer defaults
|
||
#
|
||
set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
|
||
set @save_use_stat_tables=@@use_stat_tables;
|
||
set optimizer_use_condition_selectivity=4;
|
||
set use_stat_tables='preferably';
|
||
use world;
|
||
set join_cache_level=4;
|
||
CREATE INDEX City_Name ON City(Name);
|
||
ANALYZE TABLE City, Country;
|
||
EXPLAIN
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND City.Population > 5000000
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range Name Name 302 NULL 15 Using index condition; Using where; Rowid-ordered scan
|
||
1 SIMPLE City hash_range Population,Country #hash#Country:Population 3:4 world.Country.Code 24 Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
|
||
EXPLAIN
|
||
SELECT Country.Name, Country.Population, City.Name, City.Population
|
||
FROM Country LEFT JOIN City
|
||
ON City.Country=Country.Code AND
|
||
(City.Population > 5000000 OR City.Name LIKE 'Za%')
|
||
WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE Country range Name Name 302 NULL 15 Using index condition; Using where; Rowid-ordered scan
|
||
1 SIMPLE City hash_index_merge Population,Country,City_Name #hash#Country:Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(Population,City_Name); Using where; Using join buffer (flat, BNLH join)
|
||
set @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
|
||
set @@use_stat_tables=@save_use_stat_tables;
|
||
set @@join_cache_level=@save_join_cache_level;
|
||
DROP DATABASE world;
|
||
use test;
|
||
CREATE TABLE t1(
|
||
affiliatetometaid int NOT NULL default '0',
|
||
uniquekey int NOT NULL default '0',
|
||
metaid int NOT NULL default '0',
|
||
affiliateid int NOT NULL default '0',
|
||
xml text,
|
||
isactive char(1) NOT NULL default 'Y',
|
||
PRIMARY KEY (affiliatetometaid)
|
||
);
|
||
CREATE UNIQUE INDEX t1_uniquekey ON t1(uniquekey);
|
||
CREATE INDEX t1_affiliateid ON t1(affiliateid);
|
||
CREATE INDEX t1_metaid on t1 (metaid);
|
||
INSERT INTO t1 VALUES
|
||
(1616, 1571693233, 1391, 2, NULL, 'Y'), (1943, 1993216749, 1726, 2, NULL, 'Y');
|
||
CREATE TABLE t2(
|
||
metaid int NOT NULL default '0',
|
||
name varchar(80) NOT NULL default '',
|
||
dateadded timestamp NOT NULL ,
|
||
xml text,
|
||
status int default NULL,
|
||
origin int default NULL,
|
||
gid int NOT NULL default '1',
|
||
formattypeid int default NULL,
|
||
PRIMARY KEY (metaid)
|
||
);
|
||
CREATE INDEX t2_status ON t2(status);
|
||
CREATE INDEX t2_gid ON t2(gid);
|
||
CREATE INDEX t2_formattypeid ON t2(formattypeid);
|
||
INSERT INTO t2 VALUES
|
||
(1391, "I Just Died", "2003-10-02 10:07:37", "", 1, NULL, 3, NULL),
|
||
(1726, "Me, Myself & I", "2003-12-05 11:24:36", " ", 1, NULL, 3, NULL);
|
||
CREATE TABLE t3(
|
||
mediaid int NOT NULL ,
|
||
metaid int NOT NULL default '0',
|
||
formatid int NOT NULL default '0',
|
||
status int default NULL,
|
||
path varchar(100) NOT NULL default '',
|
||
datemodified timestamp NOT NULL default now(),
|
||
resourcetype int NOT NULL default '1',
|
||
parameters text,
|
||
signature int default NULL,
|
||
quality int NOT NULL default '255',
|
||
PRIMARY KEY (mediaid)
|
||
);
|
||
CREATE INDEX t3_metaid ON t3(metaid);
|
||
CREATE INDEX t3_formatid ON t3(formatid);
|
||
CREATE INDEX t3_status ON t3(status);
|
||
CREATE INDEX t3_metaidformatid ON t3(metaid,formatid);
|
||
CREATE INDEX t3_signature ON t3(signature);
|
||
CREATE INDEX t3_quality ON t3(quality);
|
||
INSERT INTO t3 VALUES
|
||
(6, 4, 8, 0, "010101_anastacia_spmidi.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255),
|
||
(3343, 3, 8, 1, "010102_4VN4bsPwnxRQUJW5Zp1RhG2IL9vvl_8.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255);
|
||
insert into t3 (mediaid, formatid) values (1000,1),(1001,2),(1002,3),(1003,1),(1004,2),(1005,3);
|
||
CREATE TABLE t4(
|
||
formatid int NOT NULL ,
|
||
name varchar(60) NOT NULL default '',
|
||
formatclassid int NOT NULL default '0',
|
||
mime varchar(60) default NULL,
|
||
extension varchar(10) default NULL,
|
||
priority int NOT NULL default '0',
|
||
canaddtocapability char(1) NOT NULL default 'Y',
|
||
PRIMARY KEY (formatid)
|
||
);
|
||
CREATE INDEX t4_formatclassid ON t4(formatclassid);
|
||
CREATE INDEX t4_formats_idx ON t4(canaddtocapability);
|
||
INSERT INTO t4 VALUES
|
||
(19, "XHTML", 11, "text/html", "xhtml", 10, 'Y'),
|
||
(54, "AMR (wide band)", 13, "audio/amr-wb", "awb", 0, 'Y');
|
||
CREATE TABLE t5(
|
||
formatclassid int NOT NULL ,
|
||
name varchar(60) NOT NULL default '',
|
||
priority int NOT NULL default '0',
|
||
formattypeid int NOT NULL default '0',
|
||
PRIMARY KEY (formatclassid)
|
||
);
|
||
CREATE INDEX t5_formattypeid on t5(formattypeid);
|
||
INSERT INTO t5 VALUES
|
||
(11, "Info", 0, 4), (13, "Digital Audio", 0, 2);
|
||
CREATE TABLE t6(
|
||
formattypeid int NOT NULL ,
|
||
name varchar(60) NOT NULL default '',
|
||
priority int default NULL,
|
||
PRIMARY KEY (formattypeid)
|
||
);
|
||
INSERT INTO t6 VALUES
|
||
(2, "Ringtones", 0);
|
||
CREATE TABLE t7(
|
||
metaid int NOT NULL default '0',
|
||
artistid int NOT NULL default '0',
|
||
PRIMARY KEY (metaid,artistid)
|
||
);
|
||
INSERT INTO t7 VALUES
|
||
(4, 5), (3, 4);
|
||
CREATE TABLE t8(
|
||
artistid int NOT NULL ,
|
||
name varchar(80) NOT NULL default '',
|
||
PRIMARY KEY (artistid)
|
||
);
|
||
INSERT INTO t8 VALUES
|
||
(5, "Anastacia"), (4, "John Mayer");
|
||
CREATE TABLE t9(
|
||
subgenreid int NOT NULL default '0',
|
||
metaid int NOT NULL default '0',
|
||
PRIMARY KEY (subgenreid,metaid)
|
||
) ;
|
||
CREATE INDEX t9_subgenreid ON t9(subgenreid);
|
||
CREATE INDEX t9_metaid ON t9(metaid);
|
||
INSERT INTO t9 VALUES
|
||
(138, 4), (31, 3);
|
||
CREATE TABLE t10(
|
||
subgenreid int NOT NULL ,
|
||
genreid int NOT NULL default '0',
|
||
name varchar(80) NOT NULL default '',
|
||
PRIMARY KEY (subgenreid)
|
||
) ;
|
||
CREATE INDEX t10_genreid ON t10(genreid);
|
||
INSERT INTO t10 VALUES
|
||
(138, 19, ''), (31, 3, '');
|
||
CREATE TABLE t11(
|
||
genreid int NOT NULL default '0',
|
||
name char(80) NOT NULL default '',
|
||
priority int NOT NULL default '0',
|
||
masterclip char(1) default NULL,
|
||
PRIMARY KEY (genreid)
|
||
) ;
|
||
CREATE INDEX t11_masterclip ON t11( masterclip);
|
||
INSERT INTO t11 VALUES
|
||
(19, "Pop & Dance", 95, 'Y'), (3, "Rock & Alternative", 100, 'Y');
|
||
set join_cache_level=6;
|
||
EXPLAIN
|
||
SELECT t1.uniquekey, t1.xml AS affiliateXml,
|
||
t8.name AS artistName, t8.artistid,
|
||
t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
|
||
t10.subgenreid, t10.name AS subgenreName,
|
||
t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
|
||
t4.priority + t5.priority + t6.priority AS overallPriority,
|
||
t3.path AS path, t3.mediaid,
|
||
t4.formatid, t4.name AS formatName,
|
||
t5.formatclassid, t5.name AS formatclassName,
|
||
t6.formattypeid, t6.name AS formattypeName
|
||
FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
|
||
WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
|
||
t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND
|
||
t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND
|
||
t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
|
||
t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND
|
||
t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
|
||
t1.metaid = t2.metaid AND t1.affiliateid = '2';
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t6 system PRIMARY NULL NULL NULL 1
|
||
1 SIMPLE t5 ref PRIMARY,t5_formattypeid t5_formattypeid 4 const 1
|
||
1 SIMPLE t4 ref PRIMARY,t4_formatclassid,t4_formats_idx t4_formatclassid 4 test.t5.formatclassid 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t3 ref t3_metaid,t3_formatid,t3_metaidformatid t3_formatid 4 test.t4.formatid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t1 ref t1_affiliateid,t1_metaid t1_metaid 4 test.t3.metaid 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t3.metaid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t7 ref PRIMARY PRIMARY 4 test.t3.metaid 1 Using index
|
||
1 SIMPLE t8 eq_ref PRIMARY PRIMARY 4 test.t7.artistid 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t9 ref PRIMARY,t9_subgenreid,t9_metaid t9_metaid 4 test.t3.metaid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t10 eq_ref PRIMARY,t10_genreid PRIMARY 4 test.t9.subgenreid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t11 eq_ref PRIMARY PRIMARY 4 test.t10.genreid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t1.uniquekey, t1.xml AS affiliateXml,
|
||
t8.name AS artistName, t8.artistid,
|
||
t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
|
||
t10.subgenreid, t10.name AS subgenreName,
|
||
t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
|
||
t4.priority + t5.priority + t6.priority AS overallPriority,
|
||
t3.path AS path, t3.mediaid,
|
||
t4.formatid, t4.name AS formatName,
|
||
t5.formatclassid, t5.name AS formatclassName,
|
||
t6.formattypeid, t6.name AS formattypeName
|
||
FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
|
||
WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
|
||
t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND
|
||
t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND
|
||
t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
|
||
t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND
|
||
t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
|
||
t1.metaid = t2.metaid AND t1.affiliateid = '2';
|
||
uniquekey affiliateXml artistName artistid genreName genreid genrePriority subgenreid subgenreName metaName metaid metaXml overallPriority path mediaid formatid formatName formatclassid formatclassName formattypeid formattypeName
|
||
DROP TABLE t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
|
||
CREATE TABLE t1 (a1 int, filler1 char(64) default ' ' );
|
||
CREATE TABLE t2 (
|
||
a2 int, b2 int, filler2 char(64) default ' ',
|
||
PRIMARY KEY idx(a2,b2,filler2)
|
||
) ;
|
||
Warnings:
|
||
Warning 1280 Name 'idx' ignored for PRIMARY key.
|
||
CREATE TABLE t3 (b3 int, c3 int, INDEX idx(b3));
|
||
INSERT INTO t1(a1) VALUES
|
||
(4), (7), (1), (9), (8), (5), (3), (6), (2);
|
||
INSERT INTO t2(a2,b2) VALUES
|
||
(1,30), (3,40), (2,61), (6,73), (8,92), (9,27), (4,18), (5,84), (7,56),
|
||
(4,14), (6,76), (8,98), (7,55), (1,39), (2,68), (3,45), (9,21), (5,81),
|
||
(5,88), (2,65), (6,74), (9,23), (1,37), (3,44), (4,17), (8,99), (7,51),
|
||
(9,28), (7,52), (1,33), (4,13), (5,87), (3,43), (8,91), (2,62), (6,79),
|
||
(3,49), (8,93), (7,34), (5,82), (6,78), (2,63), (1,32), (9,22), (4,11);
|
||
INSERT INTO t3 VALUES
|
||
(30,302), (92,923), (18,187), (45,459), (30,309),
|
||
(39,393), (68,685), (45,458), (21,210), (81,817),
|
||
(40,405), (61,618), (73,738), (92,929), (27,275),
|
||
(18,188), (84,846), (56,564), (14,144), (76,763),
|
||
(98,982), (55,551), (17,174), (99,998), (51,513),
|
||
(28,282), (52,527), (33,336), (13,138), (87,878),
|
||
(43,431), (91,916), (62,624), (79,797), (49,494),
|
||
(93,933), (34,347), (82,829), (78,780), (63,634),
|
||
(32,329), (22,228), (11,114), (74,749), (23,236);
|
||
set join_cache_level=1;
|
||
EXPLAIN
|
||
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
||
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
||
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using where
|
||
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index
|
||
1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where
|
||
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
||
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
||
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
||
a1<>a2 a1 a2 b2 b3 c3 s1 s2
|
||
0 4 4 13 13 138
|
||
0 4 4 18 18 188
|
||
0 1 1 30 30 309
|
||
0 1 1 32 32 329
|
||
0 9 9 22 22 228
|
||
0 8 8 92 92 929
|
||
0 8 8 99 99 998
|
||
0 5 5 82 82 829
|
||
0 5 5 87 87 878
|
||
0 3 3 45 45 459
|
||
0 3 3 45 45 458
|
||
0 6 6 73 73 738
|
||
0 6 6 74 74 749
|
||
0 2 2 61 61 618
|
||
set join_cache_level=5;
|
||
set join_buffer_size=512;
|
||
EXPLAIN
|
||
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
||
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
||
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using where
|
||
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index
|
||
1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
||
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
||
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
||
a1<>a2 a1 a2 b2 b3 c3 s1 s2
|
||
0 4 4 18 18 188
|
||
0 4 4 13 13 138
|
||
0 1 1 30 30 309
|
||
0 1 1 32 32 329
|
||
0 8 8 92 92 929
|
||
0 9 9 22 22 228
|
||
0 8 8 99 99 998
|
||
0 5 5 87 87 878
|
||
0 5 5 82 82 829
|
||
0 3 3 45 45 459
|
||
0 3 3 45 45 458
|
||
0 6 6 73 73 738
|
||
0 6 6 74 74 749
|
||
0 2 2 61 61 618
|
||
DROP TABLE t1,t2,t3;
|
||
CREATE TABLE t1 (a int, b int, INDEX idx(b));
|
||
CREATE TABLE t2 (a int, b int, INDEX idx(a));
|
||
INSERT INTO t1 VALUES (5,30), (3,20), (7,40), (2,10), (8,30), (1,10), (4,20);
|
||
INSERT INTO t2 VALUES (7,10), (1,20), (2,20), (8,20), (8,10), (1,20);
|
||
INSERT INTO t2 VALUES (1,10), (4,20), (3,20), (7,20), (7,10), (1,20);
|
||
INSERT INTO t2 VALUES (17,10), (11,20), (12,20), (18,20), (18,10), (11,20);
|
||
INSERT INTO t2 VALUES (11,10), (14,20), (13,20), (17,20), (17,10), (11,20);
|
||
set join_buffer_size=32;
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect join_buffer_size value: '32'
|
||
set join_cache_level=8;
|
||
EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range idx idx 5 NULL 3 Using index condition; Using where; Rowid-ordered scan
|
||
1 SIMPLE t2 ref idx idx 5 test.t1.a 2 Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
|
||
a b a b
|
||
7 40 7 10
|
||
7 40 7 10
|
||
7 40 7 20
|
||
8 30 8 10
|
||
8 30 8 20
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #40134: outer join with not exists optimization and join buffer
|
||
#
|
||
set join_cache_level=@save_join_cache_level;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
CREATE TABLE t1 (a int NOT NULL);
|
||
INSERT INTO t1 VALUES (2), (4), (3), (5), (1);
|
||
CREATE TABLE t2 (a int NOT NULL, b int NOT NULL, INDEX i_a(a));
|
||
INSERT INTO t2 VALUES (4,10), (2,10), (2,30), (2,20), (4,20);
|
||
INSERT INTO t2 VALUES (14,10), (12,10), (15,30), (12,20), (14,20);
|
||
EXPLAIN
|
||
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
|
||
1 SIMPLE t2 ref i_a i_a 4 test.t1.a 1 Using where; Not exists
|
||
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
||
a a b
|
||
3 NULL NULL
|
||
5 NULL NULL
|
||
1 NULL NULL
|
||
SET join_cache_level=6;
|
||
EXPLAIN
|
||
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
|
||
1 SIMPLE t2 ref i_a i_a 4 test.t1.a 1 Using where; Not exists; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
||
a a b
|
||
3 NULL NULL
|
||
5 NULL NULL
|
||
1 NULL NULL
|
||
DROP TABLE t1, t2;
|
||
set join_cache_level=@save_join_cache_level;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
#
|
||
# BUG#40136: Group by is ignored when join buffer is used for an outer join
|
||
#
|
||
create table t1(a int PRIMARY KEY, b int);
|
||
insert into t1 values
|
||
(5, 10), (2, 70), (7, 80), (6, 20), (1, 50), (9, 40), (8, 30), (3, 60);
|
||
create table t2 (p int, a int, INDEX i_a(a));
|
||
insert into t2 values
|
||
(103, 7), (109, 3), (102, 3), (108, 1), (106, 3),
|
||
(107, 7), (105, 1), (101, 3), (100, 7), (110, 1);
|
||
set @save_join_cache_level=@@join_cache_level;
|
||
set join_cache_level=6;
|
||
The following must not show "using join cache":
|
||
explain
|
||
select t1.a, count(t2.p) as count
|
||
from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL PRIMARY 4 NULL 8 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t2 ref i_a i_a 5 test.t1.a 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
select t1.a, count(t2.p) as count
|
||
from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
|
||
a count
|
||
1 1
|
||
2 0
|
||
3 2
|
||
5 0
|
||
6 0
|
||
7 2
|
||
8 0
|
||
9 0
|
||
set join_cache_level=@save_join_cache_level;
|
||
drop table t1, t2;
|
||
#
|
||
# BUG#40268: Nested outer join with not null-rejecting where condition
|
||
# over an inner table which is not the last in the nest
|
||
#
|
||
CREATE TABLE t2 (a int, b int, c int);
|
||
CREATE TABLE t3 (a int, b int, c int);
|
||
CREATE TABLE t4 (a int, b int, c int);
|
||
INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
|
||
INSERT INTO t3 VALUES (1,2,0), (2,2,0);
|
||
INSERT INTO t4 VALUES (3,2,0), (4,2,0);
|
||
set join_cache_level=6;
|
||
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
|
||
FROM t2 LEFT JOIN (t3, t4) ON t2.b=t4.b
|
||
WHERE t3.a+2<t2.a OR t3.c IS NULL;
|
||
a b a b a b
|
||
4 2 1 2 3 2
|
||
4 2 1 2 4 2
|
||
3 3 NULL NULL NULL NULL
|
||
5 3 NULL NULL NULL NULL
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t2, t3, t4;
|
||
#
|
||
# Bug #40192: outer join with where clause when using BNL
|
||
#
|
||
create table t1 (a int, b int);
|
||
insert into t1 values (2, 20), (3, 30), (1, 10);
|
||
create table t2 (a int, c int);
|
||
insert into t2 values (1, 101), (3, 102), (1, 100);
|
||
set join_cache_level=6;
|
||
select * from t1 left join t2 on t1.a=t2.a;
|
||
a b a c
|
||
1 10 1 101
|
||
3 30 3 102
|
||
1 10 1 100
|
||
2 20 NULL NULL
|
||
explain select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||
1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t1.a 3 Using where; Using join buffer (flat, BNLH join)
|
||
select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
|
||
a b a c
|
||
3 30 3 102
|
||
2 20 NULL NULL
|
||
set join_cache_level=@save_join_cache_level;
|
||
drop table t1, t2;
|
||
#
|
||
# Bug #40317: outer join with with constant on expression equal to FALSE
|
||
#
|
||
create table t1 (a int);
|
||
insert into t1 values (30), (40), (20);
|
||
create table t2 (b int);
|
||
insert into t2 values (200), (100);
|
||
set join_cache_level=6;
|
||
select * from t1 left join t2 on (1=0);
|
||
a b
|
||
30 NULL
|
||
40 NULL
|
||
20 NULL
|
||
explain select * from t1 left join t2 on (1=0) where a=40;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
|
||
select * from t1 left join t2 on (1=0) where a=40;
|
||
a b
|
||
40 NULL
|
||
set join_cache_level=0;
|
||
explain select * from t1 left join t2 on (1=0);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
|
||
set join_cache_level=@save_join_cache_level;
|
||
drop table t1, t2;
|
||
#
|
||
# Bug #41204: small buffer with big rec_per_key for ref access
|
||
#
|
||
CREATE TABLE t1 (a int);
|
||
INSERT INTO t1 VALUES (0);
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1(a) SELECT a FROM t1;
|
||
INSERT INTO t1 VALUES (20000), (10000);
|
||
CREATE TABLE t2 (pk int AUTO_INCREMENT PRIMARY KEY, b int, c int, INDEX idx(b));
|
||
INSERT INTO t2(b,c) VALUES (10000, 3), (20000, 7), (20000, 1), (10000, 9), (20000, 5);
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
||
ANALYZE TABLE t1,t2;
|
||
set join_cache_level=6;
|
||
set join_buffer_size=1024;
|
||
EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL idx NULL NULL NULL 1280 Using where
|
||
1 SIMPLE t1 hash_ALL NULL #hash#$hj 5 test.t2.b 2050 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
|
||
AVG(c)
|
||
5.0000
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1, t2;
|
||
#
|
||
# Bug #41894: big join buffer of level 7 used to join records
|
||
# with null values in place of varchar strings
|
||
#
|
||
CREATE TABLE t1 (a int NOT NULL AUTO_INCREMENT PRIMARY KEY,
|
||
b varchar(127) DEFAULT NULL);
|
||
INSERT INTO t1(a) VALUES (1);
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
INSERT INTO t1(b) SELECT b FROM t1;
|
||
CREATE TABLE t2 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
|
||
INSERT INTO t2 SELECT * FROM t1;
|
||
CREATE TABLE t3 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
|
||
INSERT INTO t3 SELECT * FROM t1;
|
||
set join_cache_level=7;
|
||
set join_buffer_size=1024*1024;
|
||
EXPLAIN
|
||
SELECT COUNT(*) FROM t1,t2,t3
|
||
WHERE t1.a=t2.a AND t2.a=t3.a AND
|
||
t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 16384 Using where
|
||
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT COUNT(*) FROM t1,t2,t3
|
||
WHERE t1.a=t2.a AND t2.a=t3.a AND
|
||
t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
|
||
COUNT(*)
|
||
16384
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #42020: join buffer is used for outer join with fields of
|
||
# several outer tables in join buffer
|
||
#
|
||
CREATE TABLE t1 (
|
||
a bigint NOT NULL,
|
||
PRIMARY KEY (a)
|
||
);
|
||
INSERT INTO t1 VALUES
|
||
(2), (1);
|
||
CREATE TABLE t2 (
|
||
a bigint NOT NULL,
|
||
b bigint NOT NULL,
|
||
PRIMARY KEY (a,b)
|
||
);
|
||
INSERT INTO t2 VALUES
|
||
(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
|
||
(1,10), (1, 20), (1,30), (1,40), (1,50);
|
||
CREATE TABLE t3 (
|
||
pk bigint NOT NULL AUTO_INCREMENT,
|
||
a bigint NOT NULL,
|
||
b bigint NOT NULL,
|
||
val bigint DEFAULT '0',
|
||
PRIMARY KEY (pk),
|
||
KEY idx (a,b)
|
||
);
|
||
INSERT INTO t3(a,b) VALUES
|
||
(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
|
||
(4,30), (4,40), (4,50), (4,60), (4,70), (4,80),
|
||
(5,30), (5,40), (5,50), (5,60), (5,70), (5,80),
|
||
(7,30), (7,40), (7,50), (7,60), (7,70), (7,80);
|
||
set join_cache_level=0;
|
||
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
||
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
||
WHERE t1.a=t2.a;
|
||
a a a b b val
|
||
1 1 NULL 10 NULL NULL
|
||
1 1 NULL 20 NULL NULL
|
||
1 1 NULL 30 NULL NULL
|
||
1 1 NULL 40 NULL NULL
|
||
1 1 NULL 50 NULL NULL
|
||
2 2 2 30 30 0
|
||
2 2 2 40 40 0
|
||
2 2 2 50 50 0
|
||
2 2 2 60 60 0
|
||
2 2 2 70 70 0
|
||
2 2 2 80 80 0
|
||
set join_cache_level=6;
|
||
set join_buffer_size=256;
|
||
EXPLAIN
|
||
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
||
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
||
WHERE t1.a=t2.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index
|
||
1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index
|
||
1 SIMPLE t3 ref idx idx 16 test.t1.a,test.t2.b 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
||
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
||
WHERE t1.a=t2.a;
|
||
a a a b b val
|
||
1 1 NULL 10 NULL NULL
|
||
1 1 NULL 20 NULL NULL
|
||
1 1 NULL 30 NULL NULL
|
||
1 1 NULL 40 NULL NULL
|
||
1 1 NULL 50 NULL NULL
|
||
2 2 2 30 30 0
|
||
2 2 2 40 40 0
|
||
2 2 2 50 50 0
|
||
2 2 2 60 60 0
|
||
2 2 2 70 70 0
|
||
2 2 2 80 80 0
|
||
DROP INDEX idx ON t3;
|
||
set join_cache_level=2;
|
||
EXPLAIN
|
||
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
||
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
||
WHERE t1.a=t2.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index
|
||
1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 24 Using where; Using join buffer (flat, BNL join)
|
||
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
||
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
||
WHERE t1.a=t2.a;
|
||
a a a b b val
|
||
1 1 NULL 10 NULL NULL
|
||
1 1 NULL 20 NULL NULL
|
||
1 1 NULL 30 NULL NULL
|
||
1 1 NULL 40 NULL NULL
|
||
1 1 NULL 50 NULL NULL
|
||
2 2 2 30 30 0
|
||
2 2 2 40 40 0
|
||
2 2 2 50 50 0
|
||
2 2 2 60 60 0
|
||
2 2 2 70 70 0
|
||
2 2 2 80 80 0
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3;
|
||
create table t1(f1 int, f2 int);
|
||
insert into t1 values (1,1),(2,2),(3,3);
|
||
create table t2(f1 int not null, f2 int not null, f3 char(200), key(f1,f2));
|
||
insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
|
||
insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
|
||
(2,4, 'qwerty'),(2,5, 'qwerty');
|
||
insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
|
||
insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
|
||
(4,4, 'qwerty');
|
||
insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
|
||
insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
|
||
(2,4, 'qwerty'),(2,5, 'qwerty');
|
||
insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
|
||
insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
|
||
(4,4, 'qwerty');
|
||
flush status;
|
||
set join_cache_level=5;
|
||
select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
||
f1 f2 f3
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
explain select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
show status like "Handler_icp%";
|
||
Variable_name Value
|
||
Handler_icp_attempts 20
|
||
Handler_icp_match 4
|
||
set join_cache_level=6;
|
||
select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
||
f1 f2 f3
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
explain select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
show status like "Handler_icp%";
|
||
Variable_name Value
|
||
Handler_icp_attempts 40
|
||
Handler_icp_match 8
|
||
set join_cache_level=7;
|
||
select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
||
f1 f2 f3
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
explain select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
show status like "Handler_icp%";
|
||
Variable_name Value
|
||
Handler_icp_attempts 60
|
||
Handler_icp_match 12
|
||
set join_cache_level=8;
|
||
select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
||
f1 f2 f3
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
1 1 qwerty
|
||
2 2 qwerty
|
||
explain select t2.f1, t2.f2, t2.f3 from t1,t2
|
||
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
show status like "Handler_icp%";
|
||
Variable_name Value
|
||
Handler_icp_attempts 80
|
||
Handler_icp_match 16
|
||
drop table t1,t2;
|
||
set join_cache_level=@save_join_cache_level;
|
||
#
|
||
# Bug #42955: join with GROUP BY/ORDER BY and when BKA is enabled
|
||
#
|
||
create table t1 (d int, id1 int, index idx1 (d, id1));
|
||
insert into t1 values
|
||
(3, 20), (2, 40), (3, 10), (1, 10), (3, 20), (1, 40), (2, 30), (3, 30);
|
||
create table t2 (id1 int, id2 int, index idx2 (id1));
|
||
insert into t2 values
|
||
(20, 100), (30, 400), (20, 400), (30, 200), (10, 300), (10, 200), (40, 100),
|
||
(40, 200), (30, 300), (10, 400), (20, 200), (20, 300);
|
||
insert into t2 values
|
||
(21, 10), (31, 400), (21, 400), (31, 200), (11, 300), (11, 200), (41, 100),
|
||
(41, 200), (31, 300), (11, 400), (21, 200), (21, 300);
|
||
set join_cache_level=6;
|
||
explain
|
||
select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
|
||
where t1.d=3 group by t1.id1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ref idx1 idx1 5 const 4 Using where; Using index; Using temporary; Using filesort
|
||
1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
|
||
where t1.d=3 group by t1.id1;
|
||
id1 sum(t2.id2)
|
||
10 900
|
||
20 2000
|
||
30 900
|
||
explain
|
||
select t1.id1 from t1 join t2 on t1.id1=t2.id1
|
||
where t1.d=3 and t2.id2 > 200 order by t1.id1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ref idx1 idx1 5 const 4 Using where; Using index; Using temporary; Using filesort
|
||
1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
select t1.id1 from t1 join t2 on t1.id1=t2.id1
|
||
where t1.d=3 and t2.id2 > 200 order by t1.id1;
|
||
id1
|
||
10
|
||
10
|
||
20
|
||
20
|
||
20
|
||
20
|
||
30
|
||
30
|
||
set join_cache_level=@save_join_cache_level;
|
||
drop table t1,t2;
|
||
#
|
||
# Bug #44019: star-like multi-join query executed join_cache_level=6
|
||
#
|
||
create table t1 (a int, b int, c int, d int);
|
||
create table t2 (b int, e varchar(16), index idx(b));
|
||
create table t3 (d int, f varchar(16), index idx(d));
|
||
create table t4 (c int, g varchar(16), index idx(c));
|
||
insert into t1 values
|
||
(5, 50, 500, 5000), (3, 30, 300, 3000), (9, 90, 900, 9000),
|
||
(2, 20, 200, 2000), (4, 40, 400, 4000), (8, 80, 800, 800),
|
||
(7, 70, 700, 7000);
|
||
insert into t2 values
|
||
(30, 'bbb'), (10, 'b'), (70, 'bbbbbbb'), (60, 'bbbbbb'),
|
||
(31, 'bbb'), (11, 'b'), (71, 'bbbbbbb'), (61, 'bbbbbb'),
|
||
(32, 'bbb'), (12, 'b'), (72, 'bbbbbbb'), (62, 'bbbbbb');
|
||
insert into t2 values
|
||
(130, 'bbb'), (110, 'b'), (170, 'bbbbbbb'), (160, 'bbbbbb'),
|
||
(131, 'bbb'), (111, 'b'), (171, 'bbbbbbb'), (161, 'bbbbbb'),
|
||
(132, 'bbb'), (112, 'b'), (172, 'bbbbbbb'), (162, 'bbbbbb');
|
||
insert into t3 values
|
||
(4000, 'dddd'), (3000, 'ddd'), (1000, 'd'), (8000, 'dddddddd'),
|
||
(4001, 'dddd'), (3001, 'ddd'), (1001, 'd'), (8001, 'dddddddd'),
|
||
(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
|
||
insert into t3 values
|
||
(14000, 'dddd'), (13000, 'ddd'), (11000, 'd'), (18000, 'dddddddd'),
|
||
(14001, 'dddd'), (13001, 'ddd'), (11001, 'd'), (18001, 'dddddddd'),
|
||
(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
|
||
insert into t4 values
|
||
(200, 'cc'), (600, 'cccccc'), (300, 'ccc'), (500, 'ccccc'),
|
||
(201, 'cc'), (601, 'cccccc'), (301, 'ccc'), (501, 'ccccc'),
|
||
(202, 'cc'), (602, 'cccccc'), (302, 'ccc'), (502, 'ccccc');
|
||
insert into t4 values
|
||
(1200, 'cc'), (1600, 'cccccc'), (1300, 'ccc'), (1500, 'ccccc'),
|
||
(1201, 'cc'), (1601, 'cccccc'), (1301, 'ccc'), (1501, 'ccccc'),
|
||
(1202, 'cc'), (1602, 'cccccc'), (1302, 'ccc'), (1502, 'ccccc');
|
||
analyze table t2,t3,t4;
|
||
set join_cache_level=1;
|
||
explain
|
||
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
||
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
|
||
1 SIMPLE t2 ref idx idx 5 test.t1.b 1
|
||
1 SIMPLE t4 ref idx idx 5 test.t1.c 1
|
||
1 SIMPLE t3 ref idx idx 5 test.t1.d 1
|
||
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
||
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
||
a b c d e f g
|
||
3 30 300 3000 bbb ddd ccc
|
||
set join_cache_level=6;
|
||
explain
|
||
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
||
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
|
||
1 SIMPLE t2 ref idx idx 5 test.t1.b 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t4 ref idx idx 5 test.t1.c 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t3 ref idx idx 5 test.t1.d 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
||
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
||
a b c d e f g
|
||
3 30 300 3000 bbb ddd ccc
|
||
set join_cache_level=@save_join_cache_level;
|
||
drop table t1,t2,t3,t4;
|
||
#
|
||
# Bug #44250: Corruption of linked join buffers when using BKA
|
||
#
|
||
CREATE TABLE t1 (
|
||
id1 bigint(20) DEFAULT NULL,
|
||
id2 bigint(20) DEFAULT NULL,
|
||
id3 bigint(20) DEFAULT NULL,
|
||
num1 bigint(20) DEFAULT NULL,
|
||
num2 int(11) DEFAULT NULL,
|
||
num3 bigint(20) DEFAULT NULL
|
||
);
|
||
CREATE TABLE t2 (
|
||
id3 bigint(20) NOT NULL DEFAULT '0',
|
||
id4 bigint(20) DEFAULT NULL,
|
||
enum1 enum('Enabled','Disabled','Paused') DEFAULT NULL,
|
||
PRIMARY KEY (id3)
|
||
);
|
||
CREATE TABLE t3 (
|
||
id4 bigint(20) NOT NULL DEFAULT '0',
|
||
text1 text,
|
||
PRIMARY KEY (id4)
|
||
);
|
||
CREATE TABLE t4 (
|
||
id2 bigint(20) NOT NULL DEFAULT '0',
|
||
dummy int(11) DEFAULT '0',
|
||
PRIMARY KEY (id2)
|
||
);
|
||
CREATE TABLE t5 (
|
||
id1 bigint(20) NOT NULL DEFAULT '0',
|
||
id2 bigint(20) NOT NULL DEFAULT '0',
|
||
enum2 enum('Active','Deleted','Paused') DEFAULT NULL,
|
||
PRIMARY KEY (id1,id2)
|
||
);
|
||
set join_cache_level=8;
|
||
set join_buffer_size=2048;
|
||
EXPLAIN
|
||
SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
|
||
FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5
|
||
WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND
|
||
t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 349 Using where
|
||
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 8 test.t1.id3 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 8 test.t2.id4 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t4 eq_ref PRIMARY PRIMARY 8 test.t1.id2 1 Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 16 test.t1.id1,test.t1.id2 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
|
||
FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5
|
||
WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND
|
||
t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
|
||
id1 num3 text1 id4 id3 dummy
|
||
228172702 14 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
||
228172702 134 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
||
228172702 15 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
||
228172702 3 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
||
228808822 61 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 60 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 6 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 18 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 17 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 50 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
||
228808822 89 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 19 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 9 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 84 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 14 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 10 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 26 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 28 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
228808822 62 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4,t5;
|
||
#
|
||
# Bug#45267: Incomplete check caused wrong result.
|
||
#
|
||
CREATE TABLE t1 (
|
||
`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
|
||
);
|
||
CREATE TABLE t3 (
|
||
`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
|
||
);
|
||
INSERT INTO t3 VALUES
|
||
(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),
|
||
(16),(17),(18),(19),(20);
|
||
CREATE TABLE t2 (
|
||
`pk` int(11) NOT NULL AUTO_INCREMENT,
|
||
`int_nokey` int(11) NOT NULL,
|
||
`time_key` time NOT NULL,
|
||
PRIMARY KEY (`pk`),
|
||
KEY `time_key` (`time_key`)
|
||
);
|
||
INSERT INTO t2 VALUES (10,9,'22:36:46'),(11,0,'08:46:46');
|
||
SELECT DISTINCT t1.`pk`
|
||
FROM t1 RIGHT JOIN t2 STRAIGHT_JOIN t3 ON t2.`int_nokey` ON t2.`time_key`
|
||
GROUP BY 1;
|
||
pk
|
||
NULL
|
||
DROP TABLE IF EXISTS t1, t2, t3;
|
||
#
|
||
# Bug #46328: Use of aggregate function without GROUP BY clause
|
||
# returns many rows (vs. one )
|
||
#
|
||
CREATE TABLE t1 (
|
||
int_key int(11) NOT NULL,
|
||
KEY int_key (int_key)
|
||
);
|
||
INSERT INTO t1 VALUES
|
||
(0),(2),(2),(2),(3),(4),(5),(5),(6),(6),(8),(8),(9),(9);
|
||
CREATE TABLE t2 (
|
||
int_key int(11) NOT NULL,
|
||
KEY int_key (int_key)
|
||
);
|
||
INSERT INTO t2 VALUES (2),(3);
|
||
|
||
# The query shall return 1 record with a max value 9 and one of the
|
||
# int_key values inserted above (undefined which one). A changed
|
||
# execution plan may change the value in the second column
|
||
SELECT MAX(t1.int_key), t1.int_key
|
||
FROM t1 STRAIGHT_JOIN t2
|
||
ORDER BY t1.int_key;
|
||
MAX(t1.int_key) int_key
|
||
9 0
|
||
|
||
explain
|
||
SELECT MAX(t1.int_key), t1.int_key
|
||
FROM t1 STRAIGHT_JOIN t2
|
||
ORDER BY t1.int_key;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL int_key 4 NULL 14 Using index
|
||
1 SIMPLE t2 index NULL int_key 4 NULL 2 Using index; Using join buffer (flat, BNL join)
|
||
|
||
DROP TABLE t1,t2;
|
||
SET join_cache_level=@save_join_cache_level;
|
||
#
|
||
# Regression test for
|
||
# Bug#46733 - NULL value not returned for aggregate on empty result
|
||
# set w/ semijoin on
|
||
#
|
||
CREATE TABLE t1 (
|
||
i int(11) NOT NULL,
|
||
v varchar(1) DEFAULT NULL,
|
||
PRIMARY KEY (i)
|
||
);
|
||
INSERT INTO t1 VALUES (10,'a'),(11,'b'),(12,'c'),(13,'d');
|
||
CREATE TABLE t2 (
|
||
i int(11) NOT NULL,
|
||
v varchar(1) DEFAULT NULL,
|
||
PRIMARY KEY (i)
|
||
);
|
||
INSERT INTO t2 VALUES (1,'x'),(2,'y');
|
||
|
||
SELECT MAX(t1.i)
|
||
FROM t1 JOIN t2 ON t2.v
|
||
ORDER BY t2.v;
|
||
MAX(t1.i)
|
||
NULL
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect BOOLEAN value: 'x'
|
||
Warning 1292 Truncated incorrect BOOLEAN value: 'y'
|
||
|
||
EXPLAIN
|
||
SELECT MAX(t1.i)
|
||
FROM t1 JOIN t2 ON t2.v
|
||
ORDER BY t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index; Using join buffer (flat, BNL join)
|
||
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #45092: join buffer contains two blob columns one of which is
|
||
# used in the key employed to access the joined table
|
||
#
|
||
CREATE TABLE t1 (c1 int, c2 int, key (c2));
|
||
INSERT INTO t1 VALUES (1,1);
|
||
INSERT INTO t1 VALUES (2,2);
|
||
CREATE TABLE t2 (c1 text, c2 text);
|
||
INSERT INTO t2 VALUES('tt', 'uu');
|
||
INSERT INTO t2 VALUES('zzzz', 'xxxxxxxxx');
|
||
ANALYZE TABLE t1,t2;
|
||
set join_cache_level=6;
|
||
SELECT t1.*, t2.*, LENGTH(t2.c1), LENGTH(t2.c2) FROM t1,t2
|
||
WHERE t1.c2=LENGTH(t2.c2) and t1.c1=LENGTH(t2.c1);
|
||
c1 c2 c1 c2 LENGTH(t2.c1) LENGTH(t2.c2)
|
||
2 2 tt uu 2 2
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #51092: linked join buffer is used for a 3-way cross join query
|
||
# that selects only records of the first table
|
||
#
|
||
create table t1 (a int, b int);
|
||
insert into t1 values (1,1),(2,2);
|
||
create table t2 (a int, b int);
|
||
insert into t2 values (1,1),(2,2);
|
||
create table t3 (a int, b int);
|
||
insert into t3 values (1,1),(2,2);
|
||
set join_cache_level=1;
|
||
explain select t1.* from t1,t2,t3;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
|
||
select t1.* from t1,t2,t3;
|
||
a b
|
||
1 1
|
||
2 2
|
||
1 1
|
||
2 2
|
||
1 1
|
||
2 2
|
||
1 1
|
||
2 2
|
||
set join_cache_level=2;
|
||
explain select t1.* from t1,t2,t3;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer (incremental, BNL join)
|
||
select t1.* from t1,t2,t3;
|
||
a b
|
||
1 1
|
||
2 2
|
||
1 1
|
||
2 2
|
||
1 1
|
||
2 2
|
||
1 1
|
||
2 2
|
||
set join_cache_level=@save_join_cache_level;
|
||
drop table t1,t2,t3;
|
||
#
|
||
# Bug #52394: using join buffer for 3 table join with ref access
|
||
# LP #623209: and no references to the columns of the middle table
|
||
#
|
||
set join_cache_level=6;
|
||
CREATE TABLE t1 (a int(11), b varchar(1));
|
||
INSERT INTO t1 VALUES (6,'r'),(27,'o');
|
||
CREATE TABLE t2(a int);
|
||
INSERT INTO t2 VALUES(1),(2),(3),(4),(5);
|
||
CREATE TABLE t3 (a int(11) primary key, b varchar(1));
|
||
INSERT INTO t3 VALUES
|
||
(14,'d'),(15,'z'),(16,'e'),(17,'h'),(18,'b'),(19,'s'),(20,'e'),
|
||
(21,'j'),(22,'e'),(23,'f'),(24,'v'),(25,'x'),(26,'m'),(27,'o');
|
||
EXPLAIN
|
||
SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using join buffer (incremental, BNL join)
|
||
SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
|
||
a
|
||
27
|
||
27
|
||
27
|
||
27
|
||
27
|
||
DROP TABLE t1,t2,t3;
|
||
set join_cache_level=@save_join_cache_level;
|
||
#
|
||
# Bug #51084: Batched key access crashes for SELECT with
|
||
# derived table and LEFT JOIN
|
||
#
|
||
CREATE TABLE t1 (
|
||
carrier int,
|
||
id int PRIMARY KEY
|
||
);
|
||
INSERT INTO t1 VALUES (1,11),(1,12),(2,13);
|
||
CREATE TABLE t2 (
|
||
scan_date int,
|
||
package_id int
|
||
);
|
||
INSERT INTO t2 VALUES (2008,21),(2008,22);
|
||
CREATE TABLE t3 (
|
||
carrier int PRIMARY KEY,
|
||
id int
|
||
);
|
||
INSERT INTO t3 VALUES (1,31);
|
||
CREATE TABLE t4 (
|
||
carrier_id int,
|
||
INDEX carrier_id(carrier_id)
|
||
);
|
||
INSERT INTO t4 VALUES (31),(32);
|
||
SET join_cache_level=8;
|
||
SELECT COUNT(*)
|
||
FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
|
||
ON t3.carrier = t1.carrier;
|
||
COUNT(*)
|
||
6
|
||
EXPLAIN
|
||
SELECT COUNT(*)
|
||
FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
|
||
ON t3.carrier = t1.carrier;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.carrier 1 Using where
|
||
1 SIMPLE t4 ref carrier_id carrier_id 5 test.t3.id 1 Using index
|
||
SET join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# Bug #52636: allowing JOINs on NULL values w/ join_cache_level = 5-8
|
||
#
|
||
CREATE TABLE t1 (b int);
|
||
INSERT INTO t1 VALUES (NULL),(3);
|
||
CREATE TABLE t2 (a int, b int, KEY (b));
|
||
INSERT INTO t2 VALUES
|
||
(100,NULL),(150,200),(50,150),(250,350),(180,210),(100,150),
|
||
(101,NULL),(151,200),(51,150),(251,350),(181,210),(101,150);
|
||
set join_cache_level = 5;
|
||
explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ref b b 5 test.t1.b 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
a
|
||
NULL
|
||
NULL
|
||
set join_cache_level = 8;
|
||
explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ref b b 5 test.t1.b 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
a
|
||
NULL
|
||
NULL
|
||
delete from t1;
|
||
INSERT INTO t1 VALUES (NULL),(NULL);
|
||
set join_cache_level = 5;
|
||
explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ref b b 5 test.t1.b 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
a
|
||
NULL
|
||
NULL
|
||
DROP TABLE t1,t2;
|
||
CREATE TABLE t1 (b varchar(100));
|
||
INSERT INTO t1 VALUES (NULL),("some varchar");
|
||
CREATE TABLE t2 (a int, b varchar(100), KEY (b));
|
||
INSERT INTO t2 VALUES (100,NULL),(150,"varchar"),(200,NULL),(250,"long long varchar");
|
||
INSERT INTO t2 VALUES (100,NULL),(150,"long varchar"),(200,"varchar"),(250,"long long long varchar");
|
||
set join_cache_level = 5;
|
||
explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ref b b 103 test.t1.b 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
a
|
||
NULL
|
||
NULL
|
||
set join_cache_level = 8;
|
||
explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ref b b 103 test.t1.b 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
|
||
a
|
||
NULL
|
||
NULL
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #54359: Extra rows with join_cache_level=7,8 and two joins
|
||
# and multi-column index"
|
||
#
|
||
CREATE TABLE t1 (
|
||
pk int NOT NULL,
|
||
a int DEFAULT NULL,
|
||
b varchar(16) DEFAULT NULL,
|
||
c varchar(16) DEFAULT NULL,
|
||
INDEX idx (b,a))
|
||
;
|
||
INSERT INTO t1 VALUES (4,9,'k','k');
|
||
INSERT INTO t1 VALUES (12,5,'k','k');
|
||
set join_cache_level = 8;
|
||
EXPLAIN
|
||
SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
|
||
WHERE s.pk AND s.a >= t.pk AND s.b = t.c;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE s ref idx idx 19 test.t.c 1 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
|
||
SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
|
||
WHERE s.pk AND s.a >= t.pk AND s.b = t.c;
|
||
a
|
||
9
|
||
9
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1;
|
||
#
|
||
# Bug #54235: Extra rows with join_cache_level=6,8 and two LEFT JOINs
|
||
#
|
||
CREATE TABLE t1 (a int);
|
||
CREATE TABLE t2 (a int);
|
||
CREATE TABLE t3 (a int);
|
||
CREATE TABLE t4 (a int);
|
||
INSERT INTO t1 VALUES (null), (2), (null), (1);
|
||
set join_cache_level = 6;
|
||
EXPLAIN
|
||
SELECT t1.a
|
||
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
|
||
WHERE t1.a OR t3.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
|
||
SELECT t1.a
|
||
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
|
||
WHERE t1.a OR t3.a;
|
||
a
|
||
2
|
||
1
|
||
EXPLAIN
|
||
SELECT t1.a
|
||
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
|
||
WHERE t1.a OR t4.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
|
||
SELECT t1.a
|
||
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
|
||
WHERE t1.a OR t4.a;
|
||
a
|
||
2
|
||
1
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# Bug #663840: Memory overwrite causing crash with hash join
|
||
#
|
||
SET SESSION join_cache_level=3;
|
||
SET SESSION join_buffer_size=100;
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect join_buffer_size value: '100'
|
||
CREATE TABLE t3 (
|
||
i int NOT NULL,
|
||
j int NOT NULL,
|
||
d date NOT NULL,
|
||
t time NOT NULL,
|
||
v varchar(1) NOT NULL,
|
||
u varchar(1) NOT NULL,
|
||
INDEX idx (v)
|
||
) COLLATE=latin1_bin;
|
||
INSERT INTO t3 VALUES
|
||
(3,8,'2008-12-04','00:00:00','v','v'), (3,8,'2009-03-28','00:00:00','f','f'),
|
||
(3,5,'1900-01-01','00:55:47','v','v'), (2,8,'2009-10-02','00:00:00','s','s'),
|
||
(1,8,'1900-01-01','20:51:59','a','a'), (0,6,'2008-06-04','09:47:27','p','p'),
|
||
(8,7,'2009-01-13','21:58:29','z','z'), (5,2,'1900-01-01','22:45:53','a','a'),
|
||
(9,5,'2008-01-28','14:06:48','h','h'), (5,7,'2004-09-18','22:17:16','h','h'),
|
||
(4,2,'2006-10-14','14:59:37','v','v'), (2,9,'1900-01-01','23:37:40','v','v'),
|
||
(33,142,'2000-11-28','14:14:01','b','b'), (5,3,'2008-04-04','02:54:19','y','y'),
|
||
(1,0,'2002-07-13','06:34:26','v','v'), (9,3,'2003-01-03','18:07:38','m','m'),
|
||
(1,5,'2006-04-02','13:55:23','z','z'), (3,9,'2006-10-19','20:32:28','n','n'),
|
||
(8,1,'2005-06-08','11:57:44','d','d'), (231,107,'2006-12-26','03:10:35','a','a');
|
||
INSERT INTO t3 VALUES
|
||
(103,108,'2008-12-04','00:00:00','a','v'), (103,108,'2009-03-28','00:00:00','b','f'),
|
||
(103,105,'1900-01-01','00:55:47','c','v'), (102,108,'2009-10-02','00:00:00','d','s'),
|
||
(100,108,'1900-01-01','20:51:59','e','a'), (100,106,'2008-06-04','09:47:27','f','p'),
|
||
(108,107,'2009-01-13','21:58:29','g','z'), (105,102,'1900-01-01','22:45:53','h','a'),
|
||
(109,105,'2008-01-28','14:06:48','i','h'), (105,107,'2004-09-18','22:17:16','j','h'),
|
||
(104,102,'2006-10-14','14:59:37','k','v'), (102,109,'1900-01-01','23:37:40','l','v'),
|
||
(1033,1142,'2000-11-28','14:14:01','m','b'), (105,103,'2008-04-04','02:54:19','n','y'),
|
||
(100,100,'2002-07-13','06:34:26','o','v'), (109,103,'2003-01-03','18:07:38','p','m'),
|
||
(100,105,'2006-04-02','13:55:23','q','z'), (103,109,'2006-10-19','20:32:28','s','n'),
|
||
(108,100,'2005-06-08','11:57:44','t','d'), (1231,1107,'2006-12-26','03:10:35','v','a');
|
||
CREATE TABLE t1 SELECT * FROM t3;
|
||
DELETE FROM t1 WHERE i > 8;
|
||
CREATE TABLE t2 SELECT * FROM t3;
|
||
DELETE FROM t2 WHERE j > 10;
|
||
EXPLAIN
|
||
SELECT t1.i, t1.d, t1.v, t2.i, t2.d, t2.t, t2.v FROM t1,t2,t3
|
||
WHERE t3.u <='a' AND t2.j < 5 AND t3.v = t2.u;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 16
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 hash_ALL idx #hash#idx 3 test.t2.u 40 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT t1.i, t1.d, t1.v, t2.i, t2.d, t2.t, t2.v FROM t1,t2,t3
|
||
WHERE t3.u <='a' AND t2.j < 5 AND t3.v = t2.u;
|
||
i d v i d t v
|
||
0 2008-06-04 p 1 2002-07-13 06:34:26 v
|
||
0 2008-06-04 p 4 2006-10-14 14:59:37 v
|
||
0 2008-06-04 p 5 1900-01-01 22:45:53 a
|
||
0 2008-06-04 p 5 1900-01-01 22:45:53 a
|
||
0 2008-06-04 p 5 1900-01-01 22:45:53 a
|
||
1 1900-01-01 a 1 2002-07-13 06:34:26 v
|
||
1 1900-01-01 a 4 2006-10-14 14:59:37 v
|
||
1 1900-01-01 a 5 1900-01-01 22:45:53 a
|
||
1 1900-01-01 a 5 1900-01-01 22:45:53 a
|
||
1 1900-01-01 a 5 1900-01-01 22:45:53 a
|
||
1 2002-07-13 v 1 2002-07-13 06:34:26 v
|
||
1 2002-07-13 v 4 2006-10-14 14:59:37 v
|
||
1 2002-07-13 v 5 1900-01-01 22:45:53 a
|
||
1 2002-07-13 v 5 1900-01-01 22:45:53 a
|
||
1 2002-07-13 v 5 1900-01-01 22:45:53 a
|
||
1 2006-04-02 z 1 2002-07-13 06:34:26 v
|
||
1 2006-04-02 z 4 2006-10-14 14:59:37 v
|
||
1 2006-04-02 z 5 1900-01-01 22:45:53 a
|
||
1 2006-04-02 z 5 1900-01-01 22:45:53 a
|
||
1 2006-04-02 z 5 1900-01-01 22:45:53 a
|
||
2 1900-01-01 v 1 2002-07-13 06:34:26 v
|
||
2 1900-01-01 v 4 2006-10-14 14:59:37 v
|
||
2 1900-01-01 v 5 1900-01-01 22:45:53 a
|
||
2 1900-01-01 v 5 1900-01-01 22:45:53 a
|
||
2 1900-01-01 v 5 1900-01-01 22:45:53 a
|
||
2 2009-10-02 s 1 2002-07-13 06:34:26 v
|
||
2 2009-10-02 s 4 2006-10-14 14:59:37 v
|
||
2 2009-10-02 s 5 1900-01-01 22:45:53 a
|
||
2 2009-10-02 s 5 1900-01-01 22:45:53 a
|
||
2 2009-10-02 s 5 1900-01-01 22:45:53 a
|
||
3 1900-01-01 v 1 2002-07-13 06:34:26 v
|
||
3 1900-01-01 v 4 2006-10-14 14:59:37 v
|
||
3 1900-01-01 v 5 1900-01-01 22:45:53 a
|
||
3 1900-01-01 v 5 1900-01-01 22:45:53 a
|
||
3 1900-01-01 v 5 1900-01-01 22:45:53 a
|
||
3 2006-10-19 n 1 2002-07-13 06:34:26 v
|
||
3 2006-10-19 n 4 2006-10-14 14:59:37 v
|
||
3 2006-10-19 n 5 1900-01-01 22:45:53 a
|
||
3 2006-10-19 n 5 1900-01-01 22:45:53 a
|
||
3 2006-10-19 n 5 1900-01-01 22:45:53 a
|
||
3 2008-12-04 v 1 2002-07-13 06:34:26 v
|
||
3 2008-12-04 v 4 2006-10-14 14:59:37 v
|
||
3 2008-12-04 v 5 1900-01-01 22:45:53 a
|
||
3 2008-12-04 v 5 1900-01-01 22:45:53 a
|
||
3 2008-12-04 v 5 1900-01-01 22:45:53 a
|
||
3 2009-03-28 f 1 2002-07-13 06:34:26 v
|
||
3 2009-03-28 f 4 2006-10-14 14:59:37 v
|
||
3 2009-03-28 f 5 1900-01-01 22:45:53 a
|
||
3 2009-03-28 f 5 1900-01-01 22:45:53 a
|
||
3 2009-03-28 f 5 1900-01-01 22:45:53 a
|
||
4 2006-10-14 v 1 2002-07-13 06:34:26 v
|
||
4 2006-10-14 v 4 2006-10-14 14:59:37 v
|
||
4 2006-10-14 v 5 1900-01-01 22:45:53 a
|
||
4 2006-10-14 v 5 1900-01-01 22:45:53 a
|
||
4 2006-10-14 v 5 1900-01-01 22:45:53 a
|
||
5 1900-01-01 a 1 2002-07-13 06:34:26 v
|
||
5 1900-01-01 a 4 2006-10-14 14:59:37 v
|
||
5 1900-01-01 a 5 1900-01-01 22:45:53 a
|
||
5 1900-01-01 a 5 1900-01-01 22:45:53 a
|
||
5 1900-01-01 a 5 1900-01-01 22:45:53 a
|
||
5 2004-09-18 h 1 2002-07-13 06:34:26 v
|
||
5 2004-09-18 h 4 2006-10-14 14:59:37 v
|
||
5 2004-09-18 h 5 1900-01-01 22:45:53 a
|
||
5 2004-09-18 h 5 1900-01-01 22:45:53 a
|
||
5 2004-09-18 h 5 1900-01-01 22:45:53 a
|
||
5 2008-04-04 y 1 2002-07-13 06:34:26 v
|
||
5 2008-04-04 y 4 2006-10-14 14:59:37 v
|
||
5 2008-04-04 y 5 1900-01-01 22:45:53 a
|
||
5 2008-04-04 y 5 1900-01-01 22:45:53 a
|
||
5 2008-04-04 y 5 1900-01-01 22:45:53 a
|
||
8 2005-06-08 d 1 2002-07-13 06:34:26 v
|
||
8 2005-06-08 d 4 2006-10-14 14:59:37 v
|
||
8 2005-06-08 d 5 1900-01-01 22:45:53 a
|
||
8 2005-06-08 d 5 1900-01-01 22:45:53 a
|
||
8 2005-06-08 d 5 1900-01-01 22:45:53 a
|
||
8 2009-01-13 z 1 2002-07-13 06:34:26 v
|
||
8 2009-01-13 z 4 2006-10-14 14:59:37 v
|
||
8 2009-01-13 z 5 1900-01-01 22:45:53 a
|
||
8 2009-01-13 z 5 1900-01-01 22:45:53 a
|
||
8 2009-01-13 z 5 1900-01-01 22:45:53 a
|
||
DROP TABLE t1,t2,t3;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
SET SESSION join_buffer_size=@save_join_buffer_size;
|
||
#
|
||
# Bug #664508: 'Simple' GROUP BY + ORDER BY
|
||
# when join buffers are used
|
||
#
|
||
CREATE TABLE t1 (
|
||
pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL,
|
||
PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2 (v,i)
|
||
) COLLATE latin1_bin;
|
||
INSERT INTO t1 VALUES
|
||
(10,8,'v'), (11,8,'f'), (13,8,'s'), (14,8,'a'),
|
||
(15,6,'p'), (16,7,'z'), (17,2,'a'), (18,5,'h'), (19,7,'h'),
|
||
(25,3,'m'), (26,5,'a'), (27,9,'n'), (28,1,'d'), (29,107,'a');
|
||
INSERT INTO t1 VALUES
|
||
(110,8,'x'), (111,8,'y'), (112,5,'v'), (113,8,'z'), (114,8,'i'),
|
||
(115,6,'j'), (116,7,'t'), (117,2,'b'), (118,5,'j'), (119,7,'w'),
|
||
(125,3,'q'), (126,5,'o'), (127,9,'n'), (128,1,'e'), (129,107,'c');
|
||
INSERT INTO t1 VALUES
|
||
(210,8,'b'), (211,8,'c'), (212,5,'d'), (213,8,'e'), (214,8,'g'),
|
||
(215,6,'f'), (216,7,'h'), (217,2,'i'), (218,5,'j'), (219,7,'k'),
|
||
(225,3,'l'), (226,5,'m'), (227,9,'n'), (228,1,'o'), (229,107,'p');
|
||
CREATE TABLE t2 (
|
||
pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL,
|
||
PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2(v,i)
|
||
) COLLATE latin1_bin;
|
||
INSERT INTO t2 VALUES
|
||
(10,8,'v'), (11,8,'f'), (12,5,'v'), (13,8,'s'), (14,8,'a'),
|
||
(15,6,'p'), (16,7,'z'), (17,2,'a'), (18,5,'h'), (19,7,'h'),
|
||
(20,2,'v'), (21,9,'v'), (22,142,'b'), (23,3,'y'), (24,0,'v'),
|
||
(25,3,'m'), (26,5,'b'), (27,9,'n'), (28,1,'d'), (29,107,'a');
|
||
CREATE TABLE t3 (
|
||
pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL,
|
||
PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2(v,i)
|
||
) COLLATE latin1_bin;
|
||
INSERT INTO t3 VALUES
|
||
(1,9,'x'), (2,5,'g'), (3,1,'o'), (4,0,'g'), (5,1,'v'),
|
||
(6,190,'m'), (7,6,'x'), (8,3,'c'), (9,4,'z'), (10,3,'i'),
|
||
(11,186,'x'), (12,1,'g'), (13,8,'q'), (14,226,'m'), (15,133,'p'),
|
||
(16,6,'e'), (17,3,'t'), (18,8,'j'), (19,5,'h'), (20,7,'w');
|
||
SET SESSION join_cache_level=1;
|
||
EXPLAIN
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where
|
||
1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
v
|
||
b
|
||
h
|
||
n
|
||
v
|
||
p
|
||
EXPLAIN
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where
|
||
1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
v
|
||
b
|
||
h
|
||
n
|
||
v
|
||
p
|
||
SET SESSION join_cache_level=6;
|
||
EXPLAIN
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
v
|
||
b
|
||
h
|
||
n
|
||
v
|
||
p
|
||
EXPLAIN
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
|
||
1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
v
|
||
b
|
||
h
|
||
n
|
||
v
|
||
p
|
||
SET SESSION join_cache_level=4;
|
||
EXPLAIN
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t3 hash_ALL PRIMARY,idx2 #hash#PRIMARY 4 test.t2.i 20 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE t1 hash_ALL idx2 #hash#idx2 3 test.t3.v 44 Using where; Using join buffer (incremental, BNLH join)
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
v
|
||
b
|
||
h
|
||
n
|
||
v
|
||
p
|
||
EXPLAIN
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
|
||
1 SIMPLE t3 hash_ALL PRIMARY,idx2 #hash#PRIMARY 4 test.t2.i 20 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE t1 hash_ALL idx2 #hash#idx2 3 test.t3.v 44 Using where; Using join buffer (incremental, BNLH join)
|
||
SELECT t2.v FROM t1, t2, t3
|
||
WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
|
||
GROUP BY t2.v ORDER BY t1.pk,t2.v;
|
||
v
|
||
b
|
||
h
|
||
n
|
||
v
|
||
p
|
||
DROP TABLE t1,t2,t3;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
#
|
||
# Bug #668290: hash join with non-binary collations
|
||
#
|
||
CREATE TABLE t1 (
|
||
i int DEFAULT NULL,
|
||
cl varchar(10) CHARACTER SET latin1 DEFAULT NULL,
|
||
cu varchar(10) CHARACTER SET utf8 DEFAULT NULL,
|
||
INDEX cl (cl),
|
||
INDEX cu (cu)
|
||
);
|
||
INSERT INTO t1 VALUES
|
||
(650903552,'cmxffkpsel','z'), (535298048,'tvtjrcmxff','y'),
|
||
(1626865664,'when','for'), (39649280,'rcvljitvtj','ercvljitvt'),
|
||
(792068096,'ttercvljit','jttercvlji');
|
||
INSERT INTO t1 SELECT * FROM t1;
|
||
CREATE TABLE t2 (
|
||
cu varchar(10) CHARACTER SET utf8 DEFAULT NULL,
|
||
i int DEFAULT NULL,
|
||
cl varchar(10) CHARACTER SET latin1 DEFAULT NULL,
|
||
INDEX cu (cu),
|
||
INDEX cl (cl)
|
||
);
|
||
INSERT INTO t2 VALUES
|
||
('g',7,'like'), ('fujttercvl',6,'y'),
|
||
('s',2,'e'), ('didn\'t',0,'v'),
|
||
('gvdrodpedk',8,'chogvdrodp'), ('jichogvdro',7,'will');
|
||
EXPLAIN
|
||
SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||
1 SIMPLE t1 ref cu cu 33 func 1 Using where; Using index
|
||
SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
|
||
i
|
||
6
|
||
6
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 6
|
||
1 SIMPLE t1 hash_index cu #hash#cu:cu 33:33 func 10 Using where; Using index; Using join buffer (flat, BNLH join)
|
||
SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
|
||
i
|
||
6
|
||
6
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #669382: hash join using a ref with constant key parts
|
||
#
|
||
CREATE TABLE t1 (a int);
|
||
INSERT INTO t1 VALUES
|
||
(9), (11), (7), (8), (4), (1), (12), (3), (5);
|
||
INSERT INTO t1 SELECT * FROM t1;
|
||
INSERT INTO t1 SELECT * FROM t1;
|
||
CREATE TABLE t2 (a int, b int, c int, INDEX idx (a,b));
|
||
INSERT INTO t2 VALUES
|
||
(8, 80, 800), (1, 10, 100), (1, 11, 101), (3, 30, 300),
|
||
(1, 12, 102), (8, 81, 801), (7, 70, 700), (12, 120, 1200),
|
||
(8, 82, 802), (1, 13, 103), (1, 14, 104), (3, 31, 301),
|
||
(1, 15, 105), (8, 83, 803), (7, 71, 701);
|
||
SET SESSION join_cache_level = 4;
|
||
SET SESSION join_buffer_size = 256;
|
||
EXPLAIN
|
||
SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL idx NULL NULL NULL 15 Using where
|
||
1 SIMPLE t1 hash_ALL NULL #hash#$hj 5 test.t2.a 36 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99;
|
||
a c
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
SET SESSION join_buffer_size=@save_join_buffer_size;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #671901: hash join using a ref to a varchar field
|
||
#
|
||
CREATE TABLE t1 (
|
||
v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
|
||
i int DEFAULT NULL
|
||
);
|
||
INSERT INTO t1 VALUES
|
||
('k',8), ('abcdefjh',-575340544), ('f',77), ('because', 2), ('f',-517472256),
|
||
('abcdefjhj',5), ('z',7);
|
||
CREATE TABLE t2 (
|
||
v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
|
||
i int DEFAULT NULL,
|
||
INDEX idx (v)
|
||
);
|
||
INSERT INTO t2 VALUES
|
||
('did',5), ('was',-1631322112), ('are',3), ('abcdefjhjk',3),
|
||
('abcdefjhjk',4), ('tell',-824573952), ('t',0),('v',-1711013888),
|
||
('abcdefjhjk',1015414784), ('or',4), ('now',0), ('abcdefjhjk',-32702464),
|
||
('abcdefjhjk',4), ('time',1078394880), ('f',4), ('m',-1845559296),
|
||
('ff', 5), ('abcdefjhjk',-1074397184);
|
||
INSERT INTO t2 VALUES
|
||
('dig',5), ('were',-1631322112), ('is',3), ('abcdefjhjl',3),
|
||
('abcdefjh',4), ('told',-824573952), ('tt',0),('vv',-1711013888),
|
||
('abcdefjhjj',1015414784), ('and',4), ('here',0), ('abcdefjhjm',-32702464),
|
||
('abcdefjhji',4), ('space',1078394880), ('fs',4), ('mn',-1845559296),
|
||
('fq', 5), ('abcdefjhjp',-1074397184);
|
||
EXPLAIN
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
|
||
1 SIMPLE t2 ref idx idx 13 test.t1.v 3
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
|
||
v i
|
||
abcdefjh 4
|
||
f 4
|
||
f 4
|
||
EXPLAIN
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 7
|
||
1 SIMPLE t2 ref idx idx 13 func 3 Using index condition
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
|
||
v i
|
||
f 5
|
||
f 5
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
|
||
1 SIMPLE t2 hash_ALL idx #hash#idx 13 test.t1.v 36 Using join buffer (flat, BNLH join)
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
|
||
v i
|
||
f 4
|
||
f 4
|
||
abcdefjh 4
|
||
EXPLAIN
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 7
|
||
1 SIMPLE t2 hash_ALL idx #hash#idx 13 func 36 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
|
||
v i
|
||
f 5
|
||
f 5
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
# Bug #672497: 3 way join with tiny incremental join buffer with
|
||
# and a ref access from the first table
|
||
#
|
||
CREATE TABLE t1 (
|
||
pk int PRIMARY KEY,
|
||
v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
|
||
INDEX idx (v)
|
||
);
|
||
INSERT INTO t1 VALUES
|
||
(1,'abcdefjhjk'), (2,'i'),(3,'abcdefjhjk'), (4,'well'), (5,'abcdefjhjk'),
|
||
(6,'abcdefjhjk'), (7,'that');
|
||
CREATE TABLE t2 (
|
||
pk int PRIMARY KEY,
|
||
i int DEFAULT NULL,
|
||
v varchar(1000) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
|
||
INDEX idx (v)
|
||
);
|
||
INSERT INTO t2 VALUES
|
||
(1,6,'yes'), (2,NULL,'will'), (3,NULL,'o'), (4,NULL,'k'), (5,NULL,'she'),
|
||
(6,-1450835968,'abcdefjhjkl'), (7,-975831040,'abcdefjhjkl'), (8,NULL,'z'),
|
||
(10,-343932928,'t'),
|
||
(11,6,'yes'), (12,NULL,'will'), (13,NULL,'o'), (14,NULL,'k'), (15,NULL,'she'),
|
||
(16,-1450835968,'abcdefjhjkl'), (17,-975831040,'abcdefjhjkl'), (18,NULL,'z'),
|
||
(19,-343932928,'t');
|
||
INSERT INTO t2 VALUES
|
||
(101,6,'yes'), (102,NULL,'will'), (103,NULL,'o'), (104,NULL,'k'), (105,NULL,'she'),
|
||
(106,-1450835968,'abcdefjhjkl'), (107,-975831040,'abcdefjhjkl'), (108,NULL,'z'),
|
||
(100,-343932928,'t'),
|
||
(111,6,'yes'), (112,NULL,'will'), (113,NULL,'o'), (114,NULL,'k'), (115,NULL,'she'),
|
||
(116,-1450835968,'abcdefjhjkl'), (117,-975831040,'abcdefjhjkl'), (118,NULL,'z'),
|
||
(119,-343932928,'t');
|
||
CREATE TABLE t3 (
|
||
pk int NOT NULL PRIMARY KEY,
|
||
i int,
|
||
v varchar(1024) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
|
||
INDEX idx (v(333))
|
||
);
|
||
INSERT INTO t3 VALUES
|
||
(1,7,'abcdefjhjkl'),(2,6,'y'), (3,NULL,'to'),(4,7,'n'),(5,7,'look'), (6,NULL,'all'),
|
||
(7,1443168256,'c'), (8,1427046400,'right'),
|
||
(11,7,'abcdefjhjkl'), (12,6,'y'), (13,NULL,'to'), (14,7,'n'), (15,7,'look'),
|
||
(16,NULL,'all'), (17,1443168256,'c'), (18,1427046400,'right'),
|
||
(21,7,'abcdefjhjkl'), (22,6,'y'), (23,NULL,'to'), (24,7,'n'), (25,7,'look'),
|
||
(26,NULL,'all'), (27,1443168256,'c'), (28,1427046400,'right'),
|
||
(31,7,'abcdefjhjkl'), (32,6,'y'), (33,NULL,'to'), (34,7,'n'), (35,7,'look'),
|
||
(36,NULL,'all'), (37,1443168256,'c'), (38,1427046400,'right');
|
||
INSERT INTO t3 VALUES
|
||
(101,7,'abcdefjhjkl'),(102,6,'y'), (103,NULL,'to'),(104,7,'n'),(105,7,'look'),
|
||
(106,NULL,'all'), (107,1443168256,'c'), (108,1427046400,'right'),
|
||
(111,7,'abcdefjhjkl'), (112,6,'y'), (113,NULL,'to'), (114,7,'n'), (115,7,'look'),
|
||
(116,NULL,'all'), (117,1443168256,'c'), (118,1427046400,'right'),
|
||
(121,7,'abcdefjhjkl'), (122,6,'y'), (123,NULL,'to'), (124,7,'n'), (125,7,'look'),
|
||
(126,NULL,'all'), (127,1443168256,'c'), (128,1427046400,'right'),
|
||
(131,7,'abcdefjhjkl'), (132,6,'y'), (133,NULL,'to'), (134,7,'n'), (135,7,'look'),
|
||
(136,NULL,'all'), (137,1443168256,'c'), (138,1427046400,'right');
|
||
SET SESSION join_buffer_size = 256;
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT t3.i FROM t1,t2,t3
|
||
WHERE t1.v = t2.v AND t3.v = t1.v AND t2.i <> 0;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index idx idx 13 NULL 7 Using where; Using index
|
||
1 SIMPLE t2 hash_ALL idx #hash#idx 1003 test.t1.v 36 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE t3 hash_ALL idx #hash#idx 1002 func 64 Using where; Using join buffer (incremental, BNLH join)
|
||
SELECT t3.i FROM t1,t2,t3
|
||
WHERE t1.v = t2.v AND t3.v = t1.v AND t2.i <> 0;
|
||
i
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
SET SESSION join_buffer_size=@save_join_buffer_size;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #672551: hash join over a long varchar field
|
||
#
|
||
CREATE TABLE t1 (
|
||
pk int PRIMARY KEY,
|
||
a varchar(512) CHARSET latin1 COLLATE latin1_bin DEFAULT NULL,
|
||
INDEX idx (a)
|
||
);
|
||
INSERT INTO t1 VALUES (2, 'aa'), (5, 'ccccccc'), (3, 'bb');
|
||
CREATE TABLE t2(
|
||
pk int PRIMARY KEY,
|
||
a varchar(512) CHARSET latin1 COLLATE latin1_bin DEFAULT NULL,
|
||
INDEX idx (a)
|
||
);
|
||
INSERT INTO t2 VALUES
|
||
(10, 'a'), (20, 'c'), (30, 'aa'), (4, 'bb'),
|
||
(11, 'a'), (21, 'c'), (31, 'aa'), (41, 'cc'),
|
||
(12, 'a'), (22, 'c'), (32, 'bb'), (42, 'aa');
|
||
INSERT INTO t2 VALUES
|
||
(110, 'a'), (120, 'c'), (130, 'aa'), (14, 'bb'),
|
||
(111, 'a'), (121, 'c'), (131, 'aa'), (141, 'cc'),
|
||
(112, 'a'), (122, 'c'), (132, 'bb'), (142, 'aa');
|
||
SELECT * FROM t1,t2 WHERE t2.a=t1.a;
|
||
pk a pk a
|
||
2 aa 30 aa
|
||
2 aa 31 aa
|
||
2 aa 42 aa
|
||
2 aa 130 aa
|
||
2 aa 131 aa
|
||
2 aa 142 aa
|
||
3 bb 4 bb
|
||
3 bb 32 bb
|
||
3 bb 14 bb
|
||
3 bb 132 bb
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE t2.a=t1.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL idx NULL NULL NULL 3 Using where
|
||
1 SIMPLE t2 hash_ALL idx #hash#idx 515 test.t1.a 24 Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1,t2 WHERE t2.a=t1.a;
|
||
pk a pk a
|
||
2 aa 30 aa
|
||
3 bb 4 bb
|
||
2 aa 31 aa
|
||
3 bb 32 bb
|
||
2 aa 42 aa
|
||
2 aa 130 aa
|
||
3 bb 14 bb
|
||
2 aa 131 aa
|
||
3 bb 132 bb
|
||
2 aa 142 aa
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #674431: nested outer join when join_cache_level is set to 7
|
||
#
|
||
CREATE TABLE t1 (a int, b varchar(32)) ;
|
||
INSERT INTO t1 VALUES (5,'h'), (NULL,'j');
|
||
CREATE TABLE t2 (a int, b varchar(32), c int) ;
|
||
INSERT INTO t2 VALUES (5,'h',100), (NULL,'j',200);
|
||
CREATE TABLE t3 (a int, b varchar(32), INDEX idx(b));
|
||
INSERT INTO t3 VALUES (77,'h'), (88,'g');
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 7;
|
||
SELECT t3.a
|
||
FROM t1 LEFT JOIN
|
||
(t2 LEFT OUTER JOIN t3 ON t2.b = t3.b) ON t2.a = t1.b
|
||
WHERE t3.a BETWEEN 3 AND 11 OR t1.a <= t2.c;
|
||
a
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect INTEGER value: 'h'
|
||
Warning 1292 Truncated incorrect INTEGER value: 'j'
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #52540: nested outer join when join_cache_level is set to 3
|
||
#
|
||
CREATE TABLE t1 (a int);
|
||
INSERT INTO t1 VALUES (2);
|
||
CREATE TABLE t2 (a varchar(10));
|
||
INSERT INTO t2 VALUES ('f'),('x');
|
||
CREATE TABLE t3 (pk int(11) PRIMARY KEY);
|
||
INSERT INTO t3 VALUES (2);
|
||
CREATE TABLE t4 (a varchar(10));
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 3;
|
||
SELECT *
|
||
FROM t2 LEFT JOIN
|
||
((t1 JOIN t3 ON t1.a = t3.pk) LEFT JOIN t4 ON 1) ON 1;
|
||
a a pk a
|
||
f 2 2 NULL
|
||
x 2 2 NULL
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# Bug #674423: outer join with ON expression over only outer tables
|
||
#
|
||
CREATE TABLE t1 (a int) ;
|
||
INSERT INTO t1 VALUES ('9');
|
||
CREATE TABLE t2 (pk int, a int) ;
|
||
INSERT INTO t2 VALUES ('9',NULL), ('1',NULL);
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 0;
|
||
EXPLAIN
|
||
SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where
|
||
SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <>0 OR t2.pk < 9;
|
||
pk a a
|
||
1 NULL NULL
|
||
SET SESSION join_cache_level = 1;
|
||
EXPLAIN
|
||
SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9;
|
||
pk a a
|
||
1 NULL NULL
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #675095: nested outer join using join buffer
|
||
#
|
||
CREATE TABLE t1 (pk int, a1 int) ;
|
||
INSERT IGNORE INTO t1 VALUES (2,NULL), (8,0);
|
||
CREATE TABLE t2 (pk int, a2 int, c2 int, d2 int) ;
|
||
INSERT IGNORE INTO t2 VALUES (9,0,0,2), (1,0,0,7);
|
||
CREATE TABLE t3 (pk int, a3 int, c3 int, d3 int) ;
|
||
INSERT IGNORE INTO t3 VALUES (9,0,0,2), (1,0,0,7);
|
||
CREATE TABLE t4 (pk int, a4 int, INDEX idx(a4)) ;
|
||
INSERT IGNORE INTO t4 VALUES (2,NULL), (8,0);
|
||
INSERT IGNORE INTO t4 VALUES (12,10), (18,20);
|
||
INSERT IGNORE INTO t4 VALUES (22,11), (28,21);
|
||
INSERT IGNORE INTO t4 VALUES (32,12), (38,22);
|
||
CREATE TABLE t5 (pk int, a5 int) ;
|
||
INSERT IGNORE INTO t5 VALUES (2,0), (8,0);
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 0;
|
||
EXPLAIN EXTENDED
|
||
SELECT *
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
|
||
LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
|
||
1 SIMPLE t4 ref idx idx 5 test.t1.a1 1 100.00 Using where
|
||
1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where
|
||
Warnings:
|
||
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1
|
||
SELECT *
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
|
||
LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
|
||
pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5
|
||
2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0
|
||
2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0
|
||
2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0
|
||
2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0
|
||
8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL
|
||
SET SESSION join_cache_level = 2;
|
||
EXPLAIN EXTENDED
|
||
SELECT *
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
|
||
LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE t4 ref idx idx 5 test.t1.a1 1 100.00 Using where
|
||
1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
|
||
Warnings:
|
||
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1
|
||
SELECT *
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
|
||
LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
|
||
pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5
|
||
2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0
|
||
2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0
|
||
2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0
|
||
2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0
|
||
8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL
|
||
SET SESSION join_cache_level = 1;
|
||
EXPLAIN EXTENDED
|
||
SELECT *
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
|
||
LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
|
||
1 SIMPLE t4 ref idx idx 5 test.t1.a1 1 100.00 Using where
|
||
1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
|
||
Warnings:
|
||
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1
|
||
SELECT *
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
|
||
LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
|
||
pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5
|
||
2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0
|
||
2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0
|
||
2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0
|
||
2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0
|
||
8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4,t5;
|
||
#
|
||
# Bug #675516: nested outer join with 3 tables in the nest
|
||
# using BNL + BNLH
|
||
#
|
||
CREATE TABLE t1 (a1 int, b1 int, c1 int) ;
|
||
INSERT INTO t1 VALUES (7,8,0), (6,4,0);
|
||
CREATE TABLE t2 (a2 int) ;
|
||
INSERT INTO t2 VALUES (5);
|
||
CREATE TABLE t3 (a3 int, b3 int, c3 int, PRIMARY KEY (b3)) ;
|
||
INSERT INTO t3 VALUES (2,5,0);
|
||
CREATE TABLE t4 (a4 int, b4 int, c4 int) ;
|
||
INSERT INTO t4 VALUES (7,8,0);
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT * FROM
|
||
t1 LEFT JOIN
|
||
((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
|
||
WHERE t3.a3 IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t3 hash_ALL PRIMARY #hash#$hj 5 test.t1.c1 1 Using where; Using join buffer (flat, BNLH join)
|
||
1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t3.b3 1 Using where; Using join buffer (incremental, BNLH join)
|
||
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
SELECT * FROM
|
||
t1 LEFT JOIN
|
||
((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
|
||
WHERE t3.a3 IS NULL;
|
||
a1 b1 c1 a2 a3 b3 c3 a4 b4 c4
|
||
SET SESSION join_cache_level = 0;
|
||
EXPLAIN
|
||
SELECT * FROM
|
||
t1 LEFT JOIN
|
||
((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
|
||
WHERE t3.a3 IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
|
||
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where
|
||
SELECT * FROM
|
||
t1 LEFT JOIN
|
||
((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
|
||
WHERE t3.a3 IS NULL;
|
||
a1 b1 c1 a2 a3 b3 c3 a4 b4 c4
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# Bug #660963: nested outer join with join_cache_level set to 5
|
||
#
|
||
CREATE TABLE t1 (a1 int) ;
|
||
INSERT INTO t1 VALUES (0),(0);
|
||
CREATE TABLE t2 (a2 int, b2 int, PRIMARY KEY (a2)) ;
|
||
INSERT INTO t2 VALUES (2,1);
|
||
CREATE TABLE t3 (a3 int, b3 int, PRIMARY KEY (a3)) ;
|
||
INSERT INTO t3 VALUES (2,1);
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 6;
|
||
EXPLAIN
|
||
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
|
||
a1 a2 b2 a3 b3
|
||
0 2 1 2 1
|
||
0 2 1 2 1
|
||
SET SESSION join_cache_level = 5;
|
||
EXPLAIN
|
||
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 hash_ALL PRIMARY #hash#PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BNLH join)
|
||
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
|
||
a1 a2 b2 a3 b3
|
||
0 2 1 2 1
|
||
0 2 1 2 1
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #675922: incremental buffer for BKA with access from previous
|
||
# buffers from non-nullable columns whose values may be null
|
||
#
|
||
CREATE TABLE t1 (a1 varchar(32)) ;
|
||
INSERT INTO t1 VALUES ('s'),('k');
|
||
CREATE TABLE t2 (a2 int PRIMARY KEY, b2 varchar(32)) ;
|
||
INSERT INTO t2 VALUES (7,'s');
|
||
CREATE TABLE t3 (a3 int PRIMARY KEY, b3 varchar(32)) ;
|
||
INSERT INTO t3 VALUES (7,'s');
|
||
CREATE TABLE t4 (a4 int) ;
|
||
INSERT INTO t4 VALUES (9);
|
||
CREATE TABLE t5(a5 int PRIMARY KEY, b5 int) ;
|
||
INSERT INTO t5 VALUES (7,0);
|
||
SET SESSION optimizer_switch = 'outer_join_with_cache=on';
|
||
SET SESSION join_cache_level = 0;
|
||
EXPLAIN
|
||
SELECT t4.a4, t5.b5
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
|
||
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t3 index PRIMARY PRIMARY 4 NULL 1 Using where; Using index
|
||
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t3.a3 1 Using where
|
||
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where
|
||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
|
||
SELECT t4.a4, t5.b5
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
|
||
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
|
||
a4 b5
|
||
9 0
|
||
9 NULL
|
||
SET SESSION join_cache_level = 6;
|
||
EXPLAIN
|
||
SELECT t4.a4, t5.b5
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
|
||
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
|
||
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
|
||
SELECT t4.a4, t5.b5
|
||
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
|
||
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
|
||
a4 b5
|
||
9 0
|
||
9 NULL
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2,t3,t4,t5;
|
||
#
|
||
# Bug #670380: hash join for non-binary collation
|
||
#
|
||
CREATE TABLE t1 (pk int PRIMARY KEY, a varchar(32));
|
||
CREATE TABLE t2 (pk int PRIMARY KEY, a varchar(32), INDEX idx(a));
|
||
INSERT INTO t1 VALUES
|
||
(10,'AAA'), (20,'BBBB'), (30,'Cc'), (40,'DD'), (50,'ee');
|
||
INSERT INTO t2 VALUES
|
||
(1,'Bbbb'), (2,'BBB'), (3,'bbbb'), (4,'AaA'), (5,'CC'),
|
||
(6,'cC'), (7,'CCC'), (8,'AAA'), (9,'bBbB'), (10,'aaaa'),
|
||
(11,'a'), (12,'dd'), (13,'EE'), (14,'ee'), (15,'D'),
|
||
(101,'Bbbb'), (102,'BBB'), (103,'bbbb'), (104,'AaA'), (105,'CC'),
|
||
(106,'cC'), (107,'CCC'), (108,'AAA'), (109,'bBbB'), (110,'aaaa'),
|
||
(111,'a'), (112,'dd'), (113,'EE'), (114,'ee'), (115,'D');
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE t1.a=t2.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where
|
||
1 SIMPLE t2 hash_ALL idx #hash#idx 35 test.t1.a 30 Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1,t2 WHERE t1.a=t2.a;
|
||
pk a pk a
|
||
20 BBBB 1 Bbbb
|
||
20 BBBB 3 bbbb
|
||
10 AAA 4 AaA
|
||
30 Cc 5 CC
|
||
30 Cc 6 cC
|
||
10 AAA 8 AAA
|
||
20 BBBB 9 bBbB
|
||
40 DD 12 dd
|
||
50 ee 13 EE
|
||
50 ee 14 ee
|
||
20 BBBB 101 Bbbb
|
||
20 BBBB 103 bbbb
|
||
10 AAA 104 AaA
|
||
30 Cc 105 CC
|
||
30 Cc 106 cC
|
||
10 AAA 108 AAA
|
||
20 BBBB 109 bBbB
|
||
40 DD 112 dd
|
||
50 ee 113 EE
|
||
50 ee 114 ee
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #694092: incorrect detection of index only pushdown conditions
|
||
#
|
||
CREATE TABLE t1 (
|
||
f1 varchar(10), f3 int(11), PRIMARY KEY (f3)
|
||
);
|
||
INSERT INTO t1 VALUES ('y',1),('or',5);
|
||
CREATE TABLE t2 (
|
||
f3 int(11), f2 varchar(1024), f4 varchar(10), PRIMARY KEY (f3)
|
||
);
|
||
INSERT INTO t2 VALUES (6,'RPOYT','y'),(10,'JINQE','m');
|
||
INSERT INTO t2 VALUES (100,'Q','q'),(101,'Q','q'),(102,'Q','q'),(103,'Q','q');
|
||
INSERT INTO t2 VALUES (104,'Q','q'),(105,'Q','q'),(106,'Q','q'),(107,'Q','q');
|
||
SET SESSION join_cache_level = 1;
|
||
SET SESSION optimizer_switch = 'index_condition_pushdown=off';
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2
|
||
WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Rowid-ordered scan
|
||
1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 2 Using where; Rowid-ordered scan; Using join buffer (flat, BNL join)
|
||
SELECT * FROM t1,t2
|
||
WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
|
||
f1 f3 f3 f2 f4
|
||
SET SESSION optimizer_switch = 'index_condition_pushdown=on';
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2
|
||
WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Rowid-ordered scan
|
||
1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNL join)
|
||
SELECT * FROM t1,t2
|
||
WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
|
||
f1 f3 f3 f2 f4
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2;
|
||
CREATE TABLE t1 (f1 int, f2 varchar(10), KEY (f1), KEY (f2)) ;
|
||
INSERT INTO t1 VALUES
|
||
(4,'e'), (891879424,'l'), (-243400704,'ectlyqupbk'), (1851981824,'of'),
|
||
(-1495203840,'you'), (4,'no'), (-1436942336,'c'), (891420672,'DQQYO'),
|
||
(608698368,'qergldqmec'), (1,'x');
|
||
CREATE TABLE t2 (f3 varchar(64), KEY (f3));
|
||
INSERT INTO t2 VALUES
|
||
('d'), ('UALLN'), ('d'), ('z'), ('r'), ('YVAKV'), ('d'), ('TNGZK'), ('e'),
|
||
('xucupaxdyythsgiw'), ('why'), ('ttugkxucupaxdyyt'), ('l'), ('LHTKN'),
|
||
('d'), ('o'), ('v'), ('KGLCJ'), ('your');
|
||
SET SESSION optimizer_switch='index_merge_sort_intersection=off';
|
||
SET SESSION optimizer_switch = 'index_condition_pushdown=off';
|
||
EXPLAIN SELECT * FROM t1,t2
|
||
WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0, 100) ORDER BY t1.f2 LIMIT 1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range f1,f2 f1 5 NULL 3 Using where; Rowid-ordered scan; Using filesort
|
||
1 SIMPLE t2 ref f3 f3 67 test.t1.f2 1 Using where; Using index
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1;
|
||
f1 f2 f3
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
SET SESSION optimizer_switch = 'index_condition_pushdown=on';
|
||
EXPLAIN SELECT * FROM t1,t2
|
||
WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range f1,f2 f1 5 NULL 3 Using index condition; Using where; Rowid-ordered scan; Using filesort
|
||
1 SIMPLE t2 ref f3 f3 67 test.t1.f2 1 Using where; Using index
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1;
|
||
f1 f2 f3
|
||
SET SESSION optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #694443: hash join using IS NULL the an equi-join condition
|
||
#
|
||
CREATE TABLE t1 (a int PRIMARY KEY);
|
||
INSERT INTO t1 VALUES
|
||
(7), (4), (9), (1), (3), (8), (2);
|
||
CREATE TABLE t2 (a int, b int, INDEX idx (a));
|
||
INSERT INTO t2 VALUES
|
||
(NULL,10), (4,80), (7,70), (6,11), (7,90), (NULL,40),
|
||
(4,77), (4,50), (NULL,41), (7,99), (7,88), (8,12),
|
||
(1,21), (4,90), (7,91), (8,22), (6,92), (NULL,42),
|
||
(2,78), (2,51), (1,43), (5,97), (5,89);
|
||
SET SESSION join_cache_level = 1;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Using index
|
||
1 SIMPLE t2 ref idx idx 5 const 4 Using index condition
|
||
SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
|
||
a a b
|
||
1 NULL 10
|
||
1 NULL 40
|
||
1 NULL 41
|
||
1 NULL 42
|
||
2 NULL 10
|
||
2 NULL 40
|
||
2 NULL 41
|
||
2 NULL 42
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Using index
|
||
1 SIMPLE t2 hash_range idx #hash#idx:idx 5:5 const 4 Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
|
||
a a b
|
||
1 NULL 10
|
||
2 NULL 10
|
||
1 NULL 40
|
||
2 NULL 40
|
||
1 NULL 41
|
||
2 NULL 41
|
||
1 NULL 42
|
||
2 NULL 42
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #697557: hash join on a varchar field
|
||
#
|
||
CREATE TABLE t1 ( f1 varchar(10) , f2 int(11) , KEY (f1));
|
||
INSERT INTO t1 VALUES ('r',1), ('m',2);
|
||
CREATE TABLE t2 ( f1 varchar(10) , f2 int(11) , KEY (f1));
|
||
INSERT INTO t2 VALUES
|
||
('hgtofubn',1), ('GDOXZ',91), ('n',2), ('fggxgalh',88),
|
||
('hgtofu',1), ('GDO',101), ('n',3), ('fggxga',55),
|
||
('hgtofu',3), ('GDO',33), ('nn',3), ('fggxgarrr',77),
|
||
('jgtofu',3), ('JDO',33), ('mn',3), ('jggxgarrr',77),
|
||
('igtofu',3), ('IDO',33), ('ln',3), ('iggxgarrr',77);
|
||
SET SESSION join_cache_level=3;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE t2.f1 = t1.f1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL f1 NULL NULL NULL 2 Using where
|
||
1 SIMPLE t2 hash_ALL f1 #hash#f1 13 test.t1.f1 20 Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1,t2 WHERE t2.f1 = t1.f1;
|
||
f1 f2 f1 f2
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #707827: hash join on varchar column with NULLs
|
||
#
|
||
CREATE TABLE t1 (v varchar(1));
|
||
INSERT INTO t1 VALUES ('o'), ('u');
|
||
CREATE TABLE t2 (a int, v varchar(1), INDEX idx (v)) ;
|
||
INSERT INTO t2 VALUES
|
||
(8,NULL), (10,'b'), (5,'k'), (4,NULL),
|
||
(1,NULL), (11,'u'), (7,NULL), (2,'d'),
|
||
(18,'u'), (11,'b'), (15,'k'), (12,'d'),
|
||
(18,'x'), (11,'y'), (15,'l'), (12,'e');
|
||
SET SESSION join_buffer_size = 256;
|
||
SET SESSION join_cache_level = 4;
|
||
EXPLAIN
|
||
SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t2 hash_ALL idx #hash#idx 4 test.t1.v 16 Using join buffer (flat, BNLH join)
|
||
SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
|
||
a
|
||
11
|
||
18
|
||
SET SESSION join_cache_level = 1;
|
||
EXPLAIN
|
||
SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t2 ref idx idx 4 test.t1.v 1
|
||
SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
|
||
a
|
||
11
|
||
18
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
SET SESSION join_buffer_size=@save_join_buffer_size;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #802860: crash on join cache + derived + duplicate_weedout
|
||
#
|
||
SET SESSION optimizer_switch=
|
||
'semijoin=on,materialization=off,firstmatch=off,loosescan=off,derived_with_keys=on';
|
||
CREATE TABLE t1 (a int) ;
|
||
INSERT IGNORE INTO t1 VALUES (0), (1), (0);
|
||
CREATE TABLE t2 (a int) ;
|
||
INSERT IGNORE INTO t2 VALUES (0), (3), (0), (2);
|
||
SET SESSION join_cache_level = 0;
|
||
EXPLAIN
|
||
SELECT * FROM (SELECT DISTINCT * FROM t1) t
|
||
WHERE t.a IN (SELECT t2.a FROM t2);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where; Start temporary
|
||
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 1 End temporary
|
||
2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary
|
||
SELECT * FROM (SELECT DISTINCT * FROM t1) t
|
||
WHERE t.a IN (SELECT t2.a FROM t2);
|
||
a
|
||
0
|
||
SET SESSION join_cache_level = 1;
|
||
EXPLAIN
|
||
SELECT * FROM (SELECT DISTINCT * FROM t1) t
|
||
WHERE t.a IN (SELECT t2.a FROM t2);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where; Start temporary
|
||
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 1 End temporary
|
||
2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary
|
||
SELECT * FROM (SELECT DISTINCT * FROM t1) t
|
||
WHERE t.a IN (SELECT t2.a FROM t2);
|
||
a
|
||
0
|
||
DROP TABLE t1, t2;
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
#
|
||
# Bug #887479: join_cache_level=3 + semijoin=on
|
||
#
|
||
CREATE TABLE t1 (a int, b int);
|
||
INSERT INTO t1 VALUES (3914,17), (3710,5), (3888,20);
|
||
CREATE TABLE t2 (c int, KEY (c));
|
||
INSERT INTO t2 VALUES (27), (17), (33), (20), (3), (7), (18), (2);
|
||
SET @tmp_optimizer_switch=@@optimizer_switch;
|
||
SET SESSION optimizer_switch='semijoin=on';
|
||
SET SESSION optimizer_switch='semijoin_with_cache=on';
|
||
SET SESSION join_cache_level=1;
|
||
EXPLAIN
|
||
SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 PRIMARY t2 ref c c 5 test.t1.b 1 Using index; Start temporary; End temporary
|
||
SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
|
||
a b
|
||
3914 17
|
||
3888 20
|
||
SET SESSION join_cache_level=3;
|
||
EXPLAIN
|
||
SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
|
||
1 PRIMARY t2 hash_index c #hash#c:c 5:5 test.t1.b 8 Using index; Start temporary; End temporary; Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
|
||
a b
|
||
3914 17
|
||
3888 20
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@tmp_optimizer_switch;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# Bug #899777: join_cache_level=4 + semijoin=on
|
||
#
|
||
CREATE TABLE t1 (a int, b int, c int, UNIQUE INDEX idx (a));
|
||
INSERT INTO t1 VALUES (1,8,6), (2,2,8);
|
||
CREATE TABLE t2 (a int, b int, c int, UNIQUE INDEX idx (a));
|
||
INSERT INTO t2 VALUES (1,8,6), (2,2,8);
|
||
CREATE TABLE t3 (a int, b int, c int, UNIQUE INDEX idx (a));
|
||
INSERT INTO t3 VALUES (1,8,6), (2,2,8);
|
||
CREATE TABLE t4 (a int, b int, c int, UNIQUE INDEX idx (a));
|
||
INSERT INTO t4 VALUES (1,8,6), (2,2,8);
|
||
SET @tmp_optimizer_switch=@@optimizer_switch;
|
||
SET SESSION optimizer_switch='semijoin=on';
|
||
SET SESSION optimizer_switch='semijoin_with_cache=on';
|
||
SET SESSION join_cache_level=1;
|
||
EXPLAIN
|
||
SELECT t1.* FROM t1,t2
|
||
WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
|
||
AND t1.a = 1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 const idx idx 5 const 1
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary; Using join buffer (flat, BNL join)
|
||
1 PRIMARY t4 ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join)
|
||
SELECT t1.* FROM t1,t2
|
||
WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
|
||
AND t1.a = 1;
|
||
a b c
|
||
1 8 6
|
||
SET SESSION join_cache_level=4;
|
||
EXPLAIN
|
||
SELECT t1.* FROM t1,t2
|
||
WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
|
||
AND t1.a = 1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 const idx idx 5 const 1
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
|
||
1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; Using join buffer (flat, BNLH join)
|
||
1 PRIMARY t4 hash_ALL NULL #hash#$hj 10 const,test.t2.b 2 Using where; End temporary; Using join buffer (incremental, BNLH join)
|
||
SELECT t1.* FROM t1,t2
|
||
WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
|
||
AND t1.a = 1;
|
||
a b c
|
||
1 8 6
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# Bug #899509: an attempt to use hash join with join_cache_level=0
|
||
#
|
||
CREATE TABLE t1 (a int);
|
||
INSERT INTO t1 VALUES (8), (7);
|
||
CREATE TABLE t2 (a int);
|
||
INSERT INTO t2 VALUES (8), (7);
|
||
CREATE TABLE t3 (a int);
|
||
INSERT INTO t3 VALUES (8), (7);
|
||
set @@optimizer_switch='semijoin_with_cache=off';
|
||
set @@optimizer_switch='outer_join_with_cache=off';
|
||
set @@optimizer_switch='derived_merge=off,derived_with_keys=off';
|
||
SET join_cache_level=0;
|
||
EXPLAIN
|
||
SELECT * FROM (SELECT t1.* FROM t1, t2) t WHERE t.a IN (SELECT * FROM t3);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4
|
||
1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1
|
||
3 MATERIALIZED t3 ALL NULL NULL NULL NULL 2
|
||
2 DERIVED t1 ALL NULL NULL NULL NULL 2
|
||
2 DERIVED t2 ALL NULL NULL NULL NULL 2
|
||
SELECT * FROM (SELECT t1.* FROM t1, t2) t WHERE t.a IN (SELECT * FROM t3);
|
||
a
|
||
8
|
||
8
|
||
7
|
||
7
|
||
SELECT * FROM ( SELECT ta.* FROM t1 AS ta, t1 ) tb WHERE a IN ( SELECT * FROM t1 );
|
||
a
|
||
8
|
||
8
|
||
7
|
||
7
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #900469: semijoin + BNLH + ORDER BY
|
||
#
|
||
CREATE TABLE t1 (a int, b int);
|
||
INSERT INTO t1 VALUES (8,10);
|
||
CREATE TABLE t2 (c int, d int);
|
||
INSERT INTO t2 VALUES (8,10);
|
||
INSERT INTO t2 VALUES (9,11);
|
||
CREATE TABLE t3 (c int, d int);
|
||
INSERT INTO t3 VALUES (8,10);
|
||
INSERT INTO t3 VALUES (9,11);
|
||
set @@optimizer_switch='semijoin_with_cache=on';
|
||
set @@optimizer_switch='firstmatch=off';
|
||
SET join_cache_level=1;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNL join)
|
||
SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
|
||
a b c d
|
||
8 10 8 10
|
||
8 10 9 11
|
||
SET join_cache_level=3;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c);
|
||
a b c d
|
||
8 10 8 10
|
||
8 10 9 11
|
||
SET join_cache_level=3;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNLH join)
|
||
SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
|
||
a b c d
|
||
8 10 8 10
|
||
8 10 9 11
|
||
SET SESSION join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #901478: semijoin + ORDER BY + join_cache_level=4|6
|
||
#
|
||
CREATE TABLE t1 (a char(1));
|
||
INSERT INTO t1 VALUES ('x');
|
||
CREATE TABLE t2 (a int, b int, c int, KEY(a), KEY(b), KEY(c));
|
||
INSERT INTO t2 VALUES
|
||
(9,1,0), (7,2,8), (2,3,5), (4,2,9), (8,3,8), (3,4,1), (5,5,4);
|
||
CREATE TABLE t3 (a CHAR(1));
|
||
INSERT INTO t3 VALUES ('x');
|
||
CREATE TABLE t4 (a int, b int, c int, KEY(b), KEY(c));
|
||
INSERT INTO t4 VALUES
|
||
(9,1,0), (7,2,8), (2,3,5), (4,2,9), (8,3,8), (3,4,1), (5,5,4);
|
||
INSERT INTO t4 VALUES
|
||
(19,11,10), (17,12,18), (12,13,15), (14,12,19),
|
||
(18,13,18), (13,14,11), (15,15,14);
|
||
SET @@optimizer_switch='semijoin=on';
|
||
SET @@optimizer_switch='firstmatch=off';
|
||
SET @@optimizer_switch='mrr=off';
|
||
SET @@optimizer_switch='semijoin_with_cache=off';
|
||
set join_cache_level=1;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
|
||
t2.a BETWEEN 4 and 5
|
||
ORDER BY t2.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
||
1 PRIMARY t3 system NULL NULL NULL NULL 1
|
||
1 PRIMARY t2 range a,c a 5 NULL 2 Using index condition; Using where; Using filesort
|
||
1 PRIMARY t4 ref c c 5 test.t2.c 1 Using where; Start temporary; End temporary
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
|
||
t2.a BETWEEN 4 and 5
|
||
ORDER BY t2.b;
|
||
a a b c
|
||
x 4 2 9
|
||
x 5 5 4
|
||
set join_cache_level=4;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
|
||
t2.a BETWEEN 4 and 5
|
||
ORDER BY t2.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
|
||
1 PRIMARY t3 system NULL NULL NULL NULL 1
|
||
1 PRIMARY t2 range a,c a 5 NULL 2 Using index condition; Using where
|
||
1 PRIMARY t4 ref c c 5 test.t2.c 1 Using where; Start temporary; End temporary
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
|
||
t2.a BETWEEN 4 and 5
|
||
ORDER BY t2.b;
|
||
a a b c
|
||
x 4 2 9
|
||
x 5 5 4
|
||
SET @@optimizer_switch='semijoin_with_cache=on';
|
||
set join_cache_level=6;
|
||
EXPLAIN
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
|
||
t2.a BETWEEN 4 and 5
|
||
ORDER BY t2.b;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
|
||
1 PRIMARY t3 system NULL NULL NULL NULL 1
|
||
1 PRIMARY t2 range a,c a 5 NULL 2 Using index condition; Using where
|
||
1 PRIMARY t4 ref c c 5 test.t2.c 1 Using where; Start temporary; End temporary
|
||
SELECT * FROM t1,t2
|
||
WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
|
||
t2.a BETWEEN 4 and 5
|
||
ORDER BY t2.b;
|
||
a a b c
|
||
x 4 2 9
|
||
x 5 5 4
|
||
set join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# Bug#53305 Duplicate weedout + join buffer (join cache --level=7,8)
|
||
#
|
||
create table t1 (uid int, fid int, index(uid));
|
||
insert into t1 values
|
||
(1,1), (1,2), (1,3), (1,4),
|
||
(2,5), (2,6), (2,7), (2,8),
|
||
(3,1), (3,2), (3,9);
|
||
create table t2 (uid int primary key, name varchar(128), index(name));
|
||
insert into t2 values
|
||
(1, "A"), (2, "B"), (3, "C"), (4, "D"), (5, "E"),
|
||
(6, "F"), (7, "G"), (8, "H"), (9, "I");
|
||
create table t3 (uid int, fid int, index(uid));
|
||
insert into t3 values
|
||
(1,1), (1,2), (1,3),(1,4),
|
||
(2,5), (2,6), (2,7), (2,8),
|
||
(3,1), (3,2), (3,9);
|
||
set @@optimizer_switch='semijoin=on';
|
||
set @@optimizer_switch='materialization=off';
|
||
set @@optimizer_switch='loosescan=off,firstmatch=off';
|
||
set @@optimizer_switch='mrr_sort_keys=off';
|
||
set join_cache_level=7;
|
||
create table t4 (uid int primary key, name varchar(128), index(name));
|
||
insert into t4 values
|
||
(1, "A"), (2, "B"), (3, "C"), (4, "D"), (5, "E"),
|
||
(6, "F"), (7, "G"), (8, "H"), (9, "I");
|
||
explain select name from t2, t1
|
||
where t1.uid in (select t4.uid from t4, t3 where t3.uid=1 and t4.uid=t3.fid)
|
||
and t2.uid=t1.fid;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t3 ref uid uid 5 const 4 Using where; Start temporary
|
||
1 PRIMARY t4 eq_ref PRIMARY PRIMARY 4 test.t3.fid 1 Using index
|
||
1 PRIMARY t1 ref uid uid 5 test.t3.fid 1 Using where; End temporary; Using join buffer (flat, BKAH join); Rowid-ordered scan
|
||
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t1.fid 1 Using join buffer (flat, BKAH join); Rowid-ordered scan
|
||
select name from t2, t1
|
||
where t1.uid in (select t4.uid from t4, t3 where t3.uid=1 and t4.uid=t3.fid)
|
||
and t2.uid=t1.fid;
|
||
name
|
||
A
|
||
A
|
||
B
|
||
B
|
||
C
|
||
D
|
||
E
|
||
F
|
||
G
|
||
H
|
||
I
|
||
set join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
drop table t1,t2,t3,t4;
|
||
#
|
||
# Bug#50358 - semijoin execution of subquery with outerjoin
|
||
# emplying join buffer
|
||
#
|
||
CREATE TABLE t1 (i int);
|
||
CREATE TABLE t2 (i int);
|
||
CREATE TABLE t3 (i int);
|
||
INSERT INTO t1 VALUES (1), (2);
|
||
INSERT INTO t2 VALUES (6);
|
||
INSERT INTO t3 VALUES (1), (2);
|
||
set @@optimizer_switch='semijoin=on';
|
||
set @@optimizer_switch='materialization=on';
|
||
set join_cache_level=0;
|
||
EXPLAIN
|
||
SELECT * FROM t1 WHERE t1.i IN
|
||
(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
|
||
2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2
|
||
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 1 Using where
|
||
SELECT * FROM t1 WHERE t1.i IN
|
||
(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
|
||
i
|
||
1
|
||
2
|
||
set join_cache_level=2;
|
||
EXPLAIN
|
||
SELECT * FROM t1 WHERE t1.i IN
|
||
(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
|
||
2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2
|
||
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
SELECT * FROM t1 WHERE t1.i IN
|
||
(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
|
||
i
|
||
1
|
||
2
|
||
set join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #12546542: missing row with semijoin=off + join cache
|
||
# (LP bug #922971)
|
||
#
|
||
CREATE TABLE t1 (a varchar(1024));
|
||
INSERT INTO t1 VALUES ('v'), ('we');
|
||
CREATE TABLE t2 (
|
||
a varchar(1024) CHARACTER SET utf8 DEFAULT NULL, b int, c int
|
||
);
|
||
INSERT INTO t2 VALUES ('we',4,NULL), ('v',1305673728,6);
|
||
CREATE TABLE t3 (b int, c int);
|
||
INSERT INTO t3 VALUES (4,4);
|
||
set @@optimizer_switch='semijoin=off';
|
||
set @@optimizer_switch='materialization=off';
|
||
set join_cache_level=0;
|
||
EXPLAIN
|
||
SELECT * FROM t1
|
||
WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
|
||
WHERE t2.c < 10 OR t3.c > 1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using where
|
||
SELECT * FROM t1
|
||
WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
|
||
WHERE t2.c < 10 OR t3.c > 1);
|
||
a
|
||
v
|
||
we
|
||
set join_cache_level=2;
|
||
EXPLAIN
|
||
SELECT * FROM t1
|
||
WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
|
||
WHERE t2.c < 10 OR t3.c > 1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
||
2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
SELECT * FROM t1
|
||
WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
|
||
WHERE t2.c < 10 OR t3.c > 1);
|
||
a
|
||
v
|
||
we
|
||
set join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# lp:925985 LEFT JOIN with optimize_join_buffer_size=off +
|
||
# join_buffer_size > join_buffer_space_limit
|
||
#
|
||
CREATE TABLE t1 (a int);
|
||
INSERT INTO t1 VALUES (5), (3);
|
||
CREATE TABLE t2 (a int, b int);
|
||
INSERT INTO t2 VALUES
|
||
(3,30), (1,10), (7,70), (2,20),
|
||
(3,31), (1,11), (7,71), (2,21),
|
||
(3,32), (1,12), (7,72), (2,22);
|
||
CREATE TABLE t3 (b int, c int);
|
||
INSERT INTO t3 VALUES (32, 302), (42,400), (30,300);
|
||
set @@optimizer_switch='optimize_join_buffer_size=off';
|
||
set @@optimizer_switch='outer_join_with_cache=on';
|
||
set join_buffer_space_limit=4096;
|
||
set join_buffer_size=4096*2;
|
||
set join_cache_level=2;
|
||
EXPLAIN
|
||
SELECT * FROM t1, t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t1.a=t2.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (incremental, BNL join)
|
||
SELECT * FROM t1, t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t1.a=t2.a;
|
||
a a b b c
|
||
3 3 32 32 302
|
||
3 3 30 30 300
|
||
3 3 31 NULL NULL
|
||
set join_buffer_space_limit=@save_join_buffer_space_limit;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=@save_join_cache_level;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# Bug #1058071: LEFT JOIN using blobs
|
||
# (MDEV-564) when join buffer size is small
|
||
#
|
||
CREATE TABLE t1 (
|
||
col269 decimal(31,10) unsigned DEFAULT NULL,
|
||
col280 geometry DEFAULT NULL,
|
||
col281 tinyint(1) DEFAULT NULL,
|
||
col282 time NOT NULL,
|
||
col284 datetime DEFAULT NULL,
|
||
col286 date DEFAULT NULL,
|
||
col287 datetime DEFAULT NULL,
|
||
col288 decimal(30,29) DEFAULT NULL,
|
||
col291 time DEFAULT NULL,
|
||
col292 time DEFAULT NULL
|
||
) ENGINE=Aria;
|
||
INSERT INTO t1 VALUES
|
||
(0.0,PointFromText('POINT(9 0)'),0,'11:24:05','2013-04-14 21:30:28',NULL,'2011-12-20 06:00:34',9.9,'13:04:39',NULL),
|
||
(0.0,NULL,127,'05:43:12','2012-09-05 06:15:27','2027-01-01','2011-10-29 10:48:29',0.0,'06:24:05','11:33:37'),
|
||
(0.0,NULL,127,'12:54:41','2013-01-12 11:32:58','2011-11-03','2013-01-03 02:00:34',00,'11:54:15','20:19:15'),
|
||
(0.0,PointFromText('POINT(9 0)'),0,'19:48:07','2012-07-16 15:45:25','2012-03-25','2013-09-07 17:21:52',0.5,'17:36:54','21:24:19'),
|
||
(0.0,PointFromText('POINT(9 0)'),0,'03:43:48','2012-09-28 00:00:00','2012-06-26','2011-11-16 05:01:09',00,'01:25:42','19:30:06'),
|
||
(0.0,LineStringFromText('LINESTRING(0 0,9 9,0 0,9 0,0 0)'),127,'11:33:21','2012-03-31 10:29:22','2012-10-10','2012-04-21 19:21:06',NULL,'05:13:22','09:48:34'),
|
||
(NULL,PointFromText('POINT(9 0)'),127,'00:00:00','0000-00-00','2012-04-04 21:26:12','2013-03-04',0.0,'12:54:30',NULL),
|
||
(NULL,PointFromText('POINT(9 0)'),1,'00:00:00','2013-05-01 22:37:49','2013-06-26','2012-09-22 17:31:03',0.0,'08:09:57','11:15:36');
|
||
Warnings:
|
||
Note 1265 Data truncated for column 'col286' at row 7
|
||
CREATE TABLE t2 (b int) ENGINE=Aria;
|
||
INSERT INTO t2 VALUES (NULL);
|
||
CREATE TABLE t3 (c int) ENGINE=Aria;
|
||
INSERT INTO t3 VALUES (NULL);
|
||
set @@optimizer_switch = 'outer_join_with_cache=on,join_cache_incremental=on';
|
||
set join_buffer_size=128;
|
||
EXPLAIN
|
||
SELECT 1 AS c FROM t1 NATURAL LEFT JOIN t2 LEFT OUTER JOIN t3 ON 1
|
||
GROUP BY elt(t1.col282,1,t1.col280);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary; Using filesort
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
SELECT 1 AS c FROM t1 NATURAL LEFT JOIN t2 LEFT OUTER JOIN t3 ON 1
|
||
GROUP BY elt(t1.col282,1,t1.col280);
|
||
c
|
||
1
|
||
DROP table t1,t2,t3;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set @@optimizer_switch=@org_optimizer_switch,@local_optimizer_switch= @org_optimizer_switch;
|
||
#
|
||
# MDEV-5293: outer join, join buffering, and order by - invalid query plan
|
||
#
|
||
create table t0 (a int primary key) engine=myisam;
|
||
insert into t0 values (1);
|
||
create table t1(a int) engine=myisam;
|
||
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
||
alter table t1 add b int;
|
||
create table t2 like t1;
|
||
insert into t2 select * from t1;
|
||
#The following must use "Using temporary; Using filesort" and not just "Using filesort":
|
||
explain select * from t0,t1 left join t2 on t1.b=t2.b order by t0.a, t1.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t0 system NULL NULL NULL NULL 1 Using temporary; Using filesort
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 10
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
|
||
drop table t0,t1,t2;
|
||
# MDEV-6292: huge performance degradation for a sequence
|
||
# of LEFT JOIN operations when using join buffer
|
||
#
|
||
CREATE TABLE t1 (
|
||
id int(11) NOT NULL AUTO_INCREMENT,
|
||
col1 varchar(255) NOT NULL DEFAULT '',
|
||
PRIMARY KEY (id)
|
||
) ENGINE=INNODB;
|
||
CREATE TABLE t2 (
|
||
id int(11) NOT NULL AUTO_INCREMENT,
|
||
parent_id smallint(3) NOT NULL DEFAULT '0',
|
||
col2 varchar(25) NOT NULL DEFAULT '',
|
||
PRIMARY KEY (id)
|
||
) ENGINE=INNODB;
|
||
set join_buffer_size=8192;
|
||
set join_cache_level=0;
|
||
set @init_time:=now();
|
||
SELECT t.*
|
||
FROM
|
||
t1 t
|
||
LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val"
|
||
LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val"
|
||
LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val"
|
||
LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val"
|
||
LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val"
|
||
LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val"
|
||
LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val"
|
||
LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val"
|
||
LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val"
|
||
LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val"
|
||
LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val"
|
||
LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val"
|
||
LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val"
|
||
LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val"
|
||
LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val"
|
||
LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val"
|
||
LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val"
|
||
LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val"
|
||
LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val"
|
||
LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val"
|
||
LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val"
|
||
LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val"
|
||
LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val"
|
||
LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val"
|
||
LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val"
|
||
LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val"
|
||
LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val"
|
||
ORDER BY
|
||
col1;
|
||
id col1
|
||
select timestampdiff(second, @init_time, now()) <= 5;
|
||
timestampdiff(second, @init_time, now()) <= 5
|
||
1
|
||
set join_cache_level=2;
|
||
set @init_time:=now();
|
||
SELECT t.*
|
||
FROM
|
||
t1 t
|
||
LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val"
|
||
LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val"
|
||
LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val"
|
||
LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val"
|
||
LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val"
|
||
LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val"
|
||
LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val"
|
||
LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val"
|
||
LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val"
|
||
LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val"
|
||
LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val"
|
||
LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val"
|
||
LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val"
|
||
LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val"
|
||
LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val"
|
||
LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val"
|
||
LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val"
|
||
LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val"
|
||
LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val"
|
||
LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val"
|
||
LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val"
|
||
LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val"
|
||
LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val"
|
||
LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val"
|
||
LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val"
|
||
LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val"
|
||
LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val"
|
||
ORDER BY
|
||
col1;
|
||
id col1
|
||
select timestampdiff(second, @init_time, now()) <= 5;
|
||
timestampdiff(second, @init_time, now()) <= 5
|
||
1
|
||
EXPLAIN
|
||
SELECT t.*
|
||
FROM
|
||
t1 t
|
||
LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val"
|
||
LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val"
|
||
LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val"
|
||
LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val"
|
||
LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val"
|
||
LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val"
|
||
LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val"
|
||
LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val"
|
||
LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val"
|
||
LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val"
|
||
LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val"
|
||
LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val"
|
||
LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val"
|
||
LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val"
|
||
LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val"
|
||
LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val"
|
||
LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val"
|
||
LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val"
|
||
LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val"
|
||
LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val"
|
||
LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val"
|
||
LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val"
|
||
LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val"
|
||
LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val"
|
||
LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val"
|
||
LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val"
|
||
LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val"
|
||
ORDER BY
|
||
col1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t ALL NULL NULL NULL NULL 1 Using temporary; Using filesort
|
||
1 SIMPLE c1 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||
1 SIMPLE c2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c5 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c6 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c7 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c8 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c9 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c10 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c11 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c12 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c13 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c14 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c15 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c16 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c17 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c18 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c19 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c20 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c21 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c22 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c23 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c24 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c25 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c26 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
1 SIMPLE c27 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
set join_cache_level=@save_join_cache_level;
|
||
DROP TABLE t1,t2;
|
||
#
|
||
# MDEV-14960: BNLH used for materialized semi-join
|
||
#
|
||
CREATE TABLE t1 (i1 int);
|
||
CREATE TABLE t2 (e1 int);
|
||
CREATE TABLE t4 (e1 int);
|
||
CREATE TABLE t5 (e1 int);
|
||
INSERT INTO t1 VALUES
|
||
(1),(2),(3),(4),(5),(6),(7),(8);
|
||
INSERT INTO t1 SELECT i1+8 FROM t1;
|
||
INSERT INTO t1 SELECT i1+16 FROM t1;
|
||
INSERT INTO t1 SELECT i1+32 FROM t1;
|
||
INSERT INTO t1 SELECT i1+64 FROM t1;
|
||
INSERT INTO t2 SELECT * FROM t1;
|
||
INSERT INTO t4 SELECT * FROM t1;
|
||
INSERT INTO t5 SELECT * FROM t1;
|
||
SET join_cache_level = 6;
|
||
SET join_buffer_size=4096;
|
||
SET join_buffer_space_limit=4096;
|
||
set @@optimizer_switch = 'join_cache_hashed=on,optimize_join_buffer_size=on';
|
||
EXPLAIN SELECT * FROM t1
|
||
WHERE
|
||
i1 < 10 AND
|
||
i1 IN
|
||
(SELECT i1 FROM
|
||
(SELECT (t4.e1) i1 FROM t4
|
||
LEFT JOIN t5 ON t4.e1 = t5.e1
|
||
LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 128 Using where
|
||
1 PRIMARY t4 hash_ALL NULL #hash#$hj 5 test.t1.i1 128 Using where; Start temporary; Using join buffer (flat, BNLH join)
|
||
1 PRIMARY t5 hash_ALL NULL #hash#$hj 5 test.t4.e1 128 Using where; Using join buffer (incremental, BNLH join)
|
||
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t4.e1 128 Using where; End temporary; Using join buffer (incremental, BNLH join)
|
||
SELECT * FROM t1
|
||
WHERE
|
||
i1 < 10 AND
|
||
i1 IN
|
||
(SELECT i1 FROM
|
||
(SELECT (t4.e1) i1 FROM t4
|
||
LEFT JOIN t5 ON t4.e1 = t5.e1
|
||
LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a);
|
||
i1
|
||
1
|
||
2
|
||
3
|
||
4
|
||
5
|
||
6
|
||
7
|
||
8
|
||
9
|
||
set join_cache_level=@save_join_cache_level;
|
||
SET join_buffer_size=@save_join_buffer_size;
|
||
SET join_buffer_space_limit=@save_join_buffer_space_limit;
|
||
set @@optimizer_switch=@local_optimizer_switch;
|
||
DROP TABLE t1,t4,t5,t2;
|
||
#
|
||
# MDEV-16603: BNLH for query with materialized semi-join
|
||
#
|
||
set join_cache_level=4;
|
||
CREATE TABLE t1 ( i1 int, v1 varchar(1)) ENGINE=InnoDB;
|
||
INSERT INTO t1 VALUES (7,'x');
|
||
CREATE TABLE t2 (i1 int, v1 varchar(1), KEY v1 (v1,i1)) ENGINE=InnoDB;
|
||
INSERT INTO t2 VALUES
|
||
(NULL,'x'),(1,'x'),(3,'x'),(5,'x'),(8,'x'),(48,'x'),
|
||
(228,'x'),(3,'y'),(1,'z'),(9,'z');
|
||
ANALYZE TABLE t1,t2;
|
||
Table Op Msg_type Msg_text
|
||
test.t1 analyze status Engine-independent statistics collected
|
||
test.t1 analyze status OK
|
||
test.t2 analyze status Engine-independent statistics collected
|
||
test.t2 analyze status OK
|
||
CREATE TABLE temp
|
||
SELECT t1.i1 AS f1, t1.v1 AS f2 FROM (t2 JOIN t1 ON (t1.v1 = t2.v1));
|
||
SELECT * FROM temp
|
||
WHERE (f1,f2) IN (SELECT t1.i1, t1.v1 FROM (t2 JOIN t1 ON (t1.v1 = t2.v1)));
|
||
f1 f2
|
||
7 x
|
||
7 x
|
||
7 x
|
||
7 x
|
||
7 x
|
||
7 x
|
||
7 x
|
||
EXPLAIN EXTENDED SELECT * FROM temp
|
||
WHERE (f1,f2) IN (SELECT t1.i1, t1.v1 FROM (t2 JOIN t1 ON (t1.v1 = t2.v1)));
|
||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 1 100.00 Using where; Start temporary
|
||
1 PRIMARY temp hash_ALL NULL #hash#$hj 9 test.t1.i1,test.t1.v1 7 10.00 Using where; Using join buffer (flat, BNLH join)
|
||
1 PRIMARY t2 hash_index v1 #hash#v1:v1 4:9 test.t1.v1 10 10.00 Using index; End temporary; Using join buffer (incremental, BNLH join)
|
||
Warnings:
|
||
Note 1003 select `test`.`temp`.`f1` AS `f1`,`test`.`temp`.`f2` AS `f2` from `test`.`temp` semi join (`test`.`t2` join `test`.`t1`) where `test`.`temp`.`f1` = `test`.`t1`.`i1` and `test`.`temp`.`f2` = `test`.`t1`.`v1` and `test`.`t2`.`v1` = `test`.`t1`.`v1`
|
||
DROP TABLE t1,t2,temp;
|
||
set join_cache_level=@save_join_cache_level;
|
||
#
|
||
# MDEV-5123 Remove duplicated conditions pushed both to join_tab->select_cond and join_tab->cache_select->cond for blocked joins.
|
||
#
|
||
set expensive_subquery_limit=0;
|
||
create table t1 (c1 int);
|
||
create table t2 (c2 int);
|
||
create table t3 (c3 int);
|
||
insert into t1 values (1), (2);
|
||
insert into t2 values (1), (2);
|
||
insert into t3 values (2);
|
||
set @counter=0;
|
||
explain
|
||
select count(*) from t1 straight_join t2
|
||
where c1 = c2-0 and c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
|
||
2 UNCACHEABLE SUBQUERY t3 system NULL NULL NULL NULL 1
|
||
select count(*) from t1 straight_join t2
|
||
where c1 = c2-0 and c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1);
|
||
count(*)
|
||
2
|
||
select @counter;
|
||
@counter
|
||
2
|
||
explain
|
||
select count(*) from t1 straight_join t2
|
||
where c1 = c2-0 and
|
||
c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1) and
|
||
c2 / 2 = 1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
|
||
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
|
||
2 UNCACHEABLE SUBQUERY t3 system NULL NULL NULL NULL 1
|
||
set @counter=0;
|
||
select count(*) from t1 straight_join t2
|
||
where c1 = c2-0 and
|
||
c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1) and
|
||
c2 / 2 = 1;
|
||
count(*)
|
||
1
|
||
select @counter;
|
||
@counter
|
||
2
|
||
drop table t1,t2,t3;
|
||
set expensive_subquery_limit=@save_expensive_subquery_limit;
|
||
#
|
||
# MDEV-6071: EXPLAIN chooses to use join buffer while execution turns it down
|
||
#
|
||
create table t1 (a int);
|
||
insert into t1 values
|
||
(7), (9), (1), (4), (2), (3), (5), (8), (11), (6), (10);
|
||
explain select count(*) from t1, t1 t2 where t1.a=t2.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 11
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
|
||
set join_buffer_space_limit=1024*8;
|
||
explain select count(*) from t1, t1 t2 where t1.a=t2.a;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 11
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
|
||
set join_buffer_space_limit=@save_join_buffer_space_limit;
|
||
drop table t1;
|
||
#
|
||
# MDEV-6687: Assertion `0' failed in Protocol::end_statement on query
|
||
#
|
||
SET join_cache_level = 3;
|
||
# The following should have
|
||
# - table order PROFILING,user,
|
||
# - table db accessed with hash_ALL:
|
||
explain
|
||
SELECT * FROM INFORMATION_SCHEMA.PROFILING, mysql.db WHERE Select_priv = PAGE_FAULTS_MINOR;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
||
set join_cache_level=@save_join_cache_level;
|
||
create table t1 (c1 date not null, key (c1)) engine=innodb;
|
||
insert t1 values ('2017-12-27');
|
||
create table t2 (pk int, f1 int, f2 int);
|
||
insert t2 values (4,1,1), (6,1,1);
|
||
set join_buffer_size = 222222208;
|
||
select f2 from t2,t1 where f2 = 0;
|
||
f2
|
||
drop table t1, t2;
|
||
set join_buffer_size=@save_join_buffer_size;
|
||
#
|
||
# MDEV-21104: BNLH used for multi-join query with embedded outer join
|
||
# and possible 'not exists' optimization
|
||
#
|
||
set join_cache_level=4;
|
||
CREATE TABLE t1 (a int) ENGINE=MyISAM;
|
||
INSERT INTO t1 VALUES (1),(2);
|
||
CREATE TABLE t2 (b int, c int) ENGINE=MyISAM;
|
||
INSERT INTO t2 VALUES (1,2),(2,4);
|
||
CREATE TABLE t3 (d int, KEY(d)) ENGINE=MyISAM;
|
||
INSERT INTO t3 VALUES (1),(2);
|
||
CREATE TABLE t4 (e int primary key) ENGINE=MyISAM;
|
||
INSERT INTO t4 VALUES (1),(2);
|
||
ANALYZE TABLE t1,t2,t3,t4;
|
||
Table Op Msg_type Msg_text
|
||
test.t1 analyze status Engine-independent statistics collected
|
||
test.t1 analyze status OK
|
||
test.t2 analyze status Engine-independent statistics collected
|
||
test.t2 analyze status OK
|
||
test.t3 analyze status Engine-independent statistics collected
|
||
test.t3 analyze status OK
|
||
test.t4 analyze status Engine-independent statistics collected
|
||
test.t4 analyze status OK
|
||
SELECT * FROM t2 LEFT JOIN t3 ON c = d;
|
||
b c d
|
||
1 2 2
|
||
2 4 NULL
|
||
SELECT * FROM (t2 LEFT JOIN t3 ON c = d ) JOIN t4;
|
||
b c d e
|
||
1 2 2 1
|
||
2 4 NULL 1
|
||
1 2 2 2
|
||
2 4 NULL 2
|
||
EXPLAIN SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t4 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t4.e 2 Using where; Using join buffer (incremental, BNLH join)
|
||
1 SIMPLE t3 hash_index d #hash#d:d 5:5 test.t2.c 2 Using where; Using index; Using join buffer (incremental, BNLH join)
|
||
SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e;
|
||
a b c d e
|
||
1 1 2 2 1
|
||
2 1 2 2 1
|
||
1 2 4 NULL 2
|
||
2 2 4 NULL 2
|
||
EXPLAIN SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e
|
||
WHERE e IS NULL;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t4 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index; Not exists; Using join buffer (flat, BNL join)
|
||
1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t4.e 2 Using where; Using join buffer (incremental, BNLH join)
|
||
1 SIMPLE t3 hash_index d #hash#d:d 5:5 test.t2.c 2 Using where; Using index; Using join buffer (incremental, BNLH join)
|
||
SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e
|
||
WHERE e IS NULL;
|
||
a b c d e
|
||
DROP TABLE t1,t2,t3,t4;
|
||
set join_cache_level=@save_join_cache_level;
|
||
#
|
||
# MDEV-24767: forced BNLH used for equi-join supported by compound index
|
||
#
|
||
create table t1 (a int, b int, c int ) engine=myisam ;
|
||
create table t2 (a int, b int, c int, primary key (c,a,b)) engine=myisam ;
|
||
insert into t1 values (3,4,2), (5,6,4);
|
||
insert into t2 values (3,4,2), (5,6,4);
|
||
select t1.a, t1.b, t1.c from t1,t2
|
||
where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
|
||
a b c
|
||
3 4 2
|
||
5 6 4
|
||
explain select t1.a, t1.b, t1.c from t1,t2
|
||
where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.c,test.t1.a,test.t1.b 1 Using index
|
||
set join_cache_level=3;
|
||
select t1.a, t1.b, t1.c from t1,t2
|
||
where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
|
||
a b c
|
||
3 4 2
|
||
5 6 4
|
||
explain select t1.a, t1.b, t1.c from t1,t2
|
||
where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t2 hash_index PRIMARY #hash#PRIMARY:PRIMARY 12:12 test.t1.c,test.t1.a,test.t1.b 2 Using index; Using join buffer (flat, BNLH join)
|
||
drop table t1,t2;
|
||
set join_cache_level=@save_join_cache_level;
|
||
#
|
||
# MDEV-21243: Join buffer: condition is checked in wrong place for range access
|
||
#
|
||
create table t1(a int primary key);
|
||
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
||
create table t2 (a int);
|
||
insert into t2 select A.a + 10*B.a from t1 A, t1 B;
|
||
create table t3 (
|
||
kp1 int,
|
||
kp2 int,
|
||
col1 int,
|
||
col2 int,
|
||
key (kp1, kp2)
|
||
);
|
||
insert into t3
|
||
select
|
||
A.a,
|
||
B.a,
|
||
A.a + 100*B.a,
|
||
A.a + 100*B.a
|
||
from
|
||
t2 A, t2 B;
|
||
analyze table t3;
|
||
Table Op Msg_type Msg_text
|
||
test.t3 analyze status Engine-independent statistics collected
|
||
test.t3 analyze status Table is already up to date
|
||
# The following must have "B.col1 + 1 < 33333" attached to table B
|
||
# and not to the block-nl-join node:
|
||
explain format=json
|
||
select *
|
||
from t1 a, t3 b
|
||
where
|
||
b.kp1+1=a.a+1 and
|
||
b.kp1 <= 10 and
|
||
b.kp2 <= 10 and
|
||
b.col1 +1 < 33333;
|
||
EXPLAIN
|
||
{
|
||
"query_block": {
|
||
"select_id": 1,
|
||
"cost": "COST_REPLACED",
|
||
"nested_loop": [
|
||
{
|
||
"table": {
|
||
"table_name": "a",
|
||
"access_type": "index",
|
||
"key": "PRIMARY",
|
||
"key_length": "4",
|
||
"used_key_parts": ["a"],
|
||
"loops": 1,
|
||
"rows": 10,
|
||
"cost": "COST_REPLACED",
|
||
"filtered": 100,
|
||
"using_index": true
|
||
}
|
||
},
|
||
{
|
||
"block-nl-join": {
|
||
"table": {
|
||
"table_name": "b",
|
||
"access_type": "range",
|
||
"possible_keys": ["kp1"],
|
||
"key": "kp1",
|
||
"key_length": "10",
|
||
"used_key_parts": ["kp1", "kp2"],
|
||
"loops": 10,
|
||
"rows": 836,
|
||
"cost": "COST_REPLACED",
|
||
"filtered": 100,
|
||
"index_condition": "b.kp1 <= 10 and b.kp2 <= 10",
|
||
"attached_condition": "b.kp1 <= 10 and b.kp2 <= 10 and b.col1 + 1 < 33333"
|
||
},
|
||
"buffer_type": "flat",
|
||
"buffer_size": "54",
|
||
"join_type": "BNL",
|
||
"attached_condition": "b.kp1 + 1 = a.a + 1"
|
||
}
|
||
}
|
||
]
|
||
}
|
||
}
|
||
drop table t1,t2,t3;
|
||
# End of 10.3 tests
|
||
set @@optimizer_switch=@save_optimizer_switch;
|
||
set global innodb_stats_persistent= @innodb_stats_persistent_save;
|
||
set global innodb_stats_persistent_sample_pages=
|
||
@innodb_stats_persistent_sample_pages_save;
|
||
#
|
||
# MDEV-31226 Server crash or assertion failure with row size close to
|
||
# join_buffer_size
|
||
#
|
||
set @org_optimizer_switch=@@optimizer_switch;
|
||
set @org_join_buffer_size=@@join_buffer_size;
|
||
CREATE TABLE t (f VARCHAR(16384)) ENGINE=MyISAM CHARACTER SET utf8;
|
||
INSERT INTO t VALUES (REPEAT('a',16384)),(REPEAT('b',16384));
|
||
SET OPTIMIZER_SWITCH = 'optimize_join_buffer_size=off';
|
||
SET JOIN_BUFFER_SIZE = 16384;
|
||
explain SELECT length(concat(t1.f,t2.f)) FROM t t1, t t2;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
||
SELECT length(concat(t1.f,t2.f)) FROM t t1, t t2;
|
||
length(concat(t1.f,t2.f))
|
||
32768
|
||
32768
|
||
32768
|
||
32768
|
||
DROP TABLE t;
|
||
set @@optimizer_switch=@org_optimizer_switch;
|
||
set @@join_buffer_size=@org_join_buffer_size;
|
||
#
|
||
# MDEV-31348 Assertion `last_key_entry >= end_pos' failed in
|
||
# virtual bool JOIN_CACHE_HASHED::put_record()
|
||
#
|
||
SET JOIN_buffer_size=1;
|
||
Warnings:
|
||
Warning 1292 Truncated incorrect join_buffer_size value: '1'
|
||
SET SESSION JOIN_cache_level=4;
|
||
SET SESSION optimizer_switch='optimize_JOIN_buffer_size=OFF';
|
||
SELECT * FROM information_schema.statistics JOIN information_schema.COLUMNS USING (table_name,column_name);
|
||
ERROR HY001: Could not create a join buffer. Please check and adjust the value of the variables 'JOIN_BUFFER_SIZE (128)' and 'JOIN_BUFFER_SPACE_LIMIT (2097152)'
|
||
SET JOIN_buffer_size=16384;
|
||
SELECT * FROM information_schema.statistics JOIN information_schema.COLUMNS USING (table_name,column_name);
|
||
#
|
||
# MDEV-32351: Join buffer used for outer join with ON condition
|
||
# depending only on outer tables
|
||
#
|
||
CREATE TABLE t1 (b int NOT NULL, PRIMARY KEY (b)) ENGINE=MYISAM;
|
||
INSERT INTO t1 select seq from seq_1_to_10000;
|
||
CREATE TABLE t2 (b int NOT NULL, d varchar(255), KEY (b)) ENGINE=MYISAM ;
|
||
INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
|
||
CREATE TABLE t3 (c int NOT NULL, PRIMARY KEY (c)) ENGINE=MYISAM ;
|
||
INSERT INTO t3 select seq from seq_1_to_3000;
|
||
CREATE TABLE t4 (c int NOT NULL, PRIMARY KEY (c)) ENGINE=MYISAM;
|
||
INSERT INTO t4 select seq from seq_1_to_3000;
|
||
ANALYZE TABLE t1,t2,t3,t4;
|
||
Table Op Msg_type Msg_text
|
||
test.t1 analyze status Engine-independent statistics collected
|
||
test.t1 analyze status OK
|
||
test.t2 analyze status Engine-independent statistics collected
|
||
test.t2 analyze status OK
|
||
test.t3 analyze status Engine-independent statistics collected
|
||
test.t3 analyze status OK
|
||
test.t4 analyze status Engine-independent statistics collected
|
||
test.t4 analyze status OK
|
||
set join_cache_level=0;
|
||
EXPLAIN SELECT COUNT(*)
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL PRIMARY 4 NULL 10000 Using index
|
||
1 SIMPLE t2 ref b b 4 test.t1.b 1
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
|
||
1 SIMPLE t4 index NULL PRIMARY 4 NULL 3000 Using where; Using index
|
||
SELECT COUNT(*)
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
COUNT(*)
|
||
12999
|
||
set join_cache_level=default;
|
||
EXPLAIN SELECT COUNT(*)
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL PRIMARY 4 NULL 10000 Using index
|
||
1 SIMPLE t2 ref b b 4 test.t1.b 1
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
|
||
1 SIMPLE t4 index NULL PRIMARY 4 NULL 3000 Using where; Using index; Using join buffer (flat, BNL join)
|
||
SELECT COUNT(*)
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
COUNT(*)
|
||
12999
|
||
DROP TABLE t1,t2,t3,t4;
|
||
CREATE TABLE t1 (b int NOT NULL, PRIMARY KEY (b));
|
||
INSERT INTO t1 select seq from seq_1_to_10;
|
||
CREATE TABLE t2 (b int NOT NULL, d varchar(255), KEY (b)) ;
|
||
INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
|
||
CREATE TABLE t3 (c int NOT NULL, PRIMARY KEY (c)) ;
|
||
INSERT INTO t3 select seq from seq_1_to_3;
|
||
CREATE TABLE t4 (c int NOT NULL, PRIMARY KEY (c)) ;
|
||
INSERT INTO t4 select seq from seq_1_to_3;
|
||
set join_cache_level=0;
|
||
EXPLAIN SELECT *
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL PRIMARY 4 NULL 10 Using index
|
||
1 SIMPLE t2 ref b b 4 test.t1.b 1
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
|
||
1 SIMPLE t4 index NULL PRIMARY 4 NULL 3 Using where; Using index
|
||
SELECT *
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
b b d c c
|
||
1 1 1 1 1
|
||
1 1 1 1 2
|
||
1 1 1 1 3
|
||
2 2 2 2 NULL
|
||
3 3 3 3 NULL
|
||
4 NULL NULL NULL NULL
|
||
5 NULL NULL NULL NULL
|
||
6 NULL NULL NULL NULL
|
||
7 NULL NULL NULL NULL
|
||
8 NULL NULL NULL NULL
|
||
9 NULL NULL NULL NULL
|
||
10 NULL NULL NULL NULL
|
||
set join_cache_level=default;
|
||
EXPLAIN SELECT *
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 index NULL PRIMARY 4 NULL 10 Using index
|
||
1 SIMPLE t2 ref b b 4 test.t1.b 1
|
||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
|
||
1 SIMPLE t4 index NULL PRIMARY 4 NULL 3 Using where; Using index; Using join buffer (flat, BNL join)
|
||
SELECT *
|
||
FROM t1
|
||
LEFT JOIN t2 ON t1.b = t2.b
|
||
LEFT JOIN t3 ON t2.d = t3.c
|
||
LEFT JOIN t4 ON t3.c=1;
|
||
b b d c c
|
||
1 1 1 1 1
|
||
1 1 1 1 2
|
||
1 1 1 1 3
|
||
2 2 2 2 NULL
|
||
3 3 3 3 NULL
|
||
4 NULL NULL NULL NULL
|
||
5 NULL NULL NULL NULL
|
||
6 NULL NULL NULL NULL
|
||
7 NULL NULL NULL NULL
|
||
8 NULL NULL NULL NULL
|
||
9 NULL NULL NULL NULL
|
||
10 NULL NULL NULL NULL
|
||
DROP TABLE t1,t2,t3,t4;
|
||
#
|
||
# MDEV-21102: Server crashes in JOIN_CACHE::write_record_data upon EXPLAIN with subqueries and constant tables
|
||
#
|
||
CREATE TABLE t1 (a int, b int) ENGINE=MyISAM;
|
||
CREATE TABLE t2 (c int, d int) ENGINE=MyISAM;
|
||
INSERT INTO t2 VALUES (1,10);
|
||
CREATE TABLE t3 (e int, key (e)) ENGINE=MyISAM;
|
||
INSERT INTO t3 VALUES (2),(3);
|
||
# Must not crash, must use join buffer in subquery
|
||
EXPLAIN
|
||
SELECT * FROM t1
|
||
WHERE a > b OR a IN (
|
||
SELECT c FROM t2 WHERE EXISTS (
|
||
SELECT * FROM t3 t3a JOIN t3 t3b WHERE t3a.e < d
|
||
)
|
||
);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
||
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
|
||
3 SUBQUERY t3a range e e 5 NULL 2 Using where; Using index
|
||
3 SUBQUERY t3b index NULL e 5 NULL 2 Using index; Using join buffer (flat, BNL join)
|
||
DROP TABLE t1,t2,t3;
|
||
#
|
||
# End of 10.4 tests
|
||
#
|
||
#
|
||
# MDEV-34580: Assertion `(key_part->key_part_flag & 4) == 0' failed key_hashnr
|
||
#
|
||
SET join_cache_level=3;
|
||
CREATE TABLE t1 ( a TIMESTAMP , b varchar(100), c varchar(10) ) ;
|
||
INSERT INTO t1 (b,c) VALUES ('GHOBS','EMLCG'),('t','p');
|
||
CREATE TABLE t2 (a varchar(100), b varchar(100), c varchar(10) , KEY b (b(66))) ;
|
||
insert into t2 select seq, seq, seq from seq_1_to_20;
|
||
explain
|
||
SELECT t1.a FROM t1 JOIN t2 ON t1.b = t2.b ;
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
|
||
1 SIMPLE t2 hash_ALL b #hash#b 69 test.t1.b 20 Using where; Using join buffer (flat, BNLH join)
|
||
SELECT t1.a FROM t1 JOIN t2 ON t1.b = t2.b ;
|
||
a
|
||
set join_cache_level=default;
|
||
DROP TABLE t1, t2;
|
||
#
|
||
# End of 10.5 tests
|
||
#
|
||
#
|
||
# MDEV-36165: BKA join cache buffer is employed despite join_cache_level=3 (flat BNLH)
|
||
#
|
||
CREATE TABLE t1(a INT);
|
||
INSERT INTO t1 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
||
CREATE TABLE t2(a INT, b INT);
|
||
INSERT INTO t2 SELECT a, a from t1;
|
||
CREATE TABLE t3(a INT, b INT, c INT, key (a,b));
|
||
INSERT INTO t3 select a, a, a FROM t1;
|
||
SET optimizer_switch = 'join_cache_hashed=off,join_cache_bka=on,mrr=on';
|
||
SET join_cache_level = 3;
|
||
EXPLAIN SELECT * FROM t2, t3 WHERE t2.a=t3.a AND (t3.b+1 <= t2.b+1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 10 Using where
|
||
1 SIMPLE t3 ref a a 5 test.t2.a 1 Using index condition
|
||
SET join_cache_level = 4;
|
||
EXPLAIN SELECT * FROM t2, t3 WHERE t2.a=t3.a AND (t3.b+1 <= t2.b+1);
|
||
id select_type table type possible_keys key key_len ref rows Extra
|
||
1 SIMPLE t2 ALL NULL NULL NULL NULL 10 Using where
|
||
1 SIMPLE t3 ref a a 5 test.t2.a 1 Using index condition
|
||
SET join_cache_level = default;
|
||
SET optimizer_switch = default;
|
||
DROP TABLE t1, t2, t3;
|
||
#
|
||
# End of 10.11 tests
|
||
#
|
||
ALTER DATABASE test CHARACTER SET utf8mb4 COLLATE utf8mb4_uca1400_ai_ci;
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