mirror of
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658128af43
This patch contains a full implementation of the optimization
that allows to use in-memory rowid / primary filters built for range
conditions over indexes. In many cases usage of such filters reduce
the number of disk seeks spent for fetching table rows.
In this implementation the choice of what possible filter to be applied
(if any) is made purely on cost-based considerations.
This implementation re-achitectured the partial implementation of
the feature pushed by Galina Shalygina in the commit
8d5a11122c.
Besides this patch contains a better implementation of the generic
handler function handler::multi_range_read_info_const() that
takes into account gaps between ranges when calculating the cost of
range index scans. It also contains some corrections of the
implementation of the handler function records_in_range() for MyISAM.
This patch supports the feature for InnoDB and MyISAM.
408 lines
12 KiB
Text
408 lines
12 KiB
Text
drop table if exists t1;
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create table t1 (a varchar(10), key(a));
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insert into t1 values ("a"),("abc"),("abcd"),("hello"),("test");
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explain extended select * from t1 where a like 'abc%';
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 index a a 13 NULL 5 40.00 Using where; Using index
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` like 'abc%'
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explain extended select * from t1 where a like concat('abc','%');
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 index a a 13 NULL 5 40.00 Using where; Using index
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` like <cache>(concat('abc','%'))
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select * from t1 where a like "abc%";
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a
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abc
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abcd
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select * from t1 where a like concat("abc","%");
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a
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abc
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abcd
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select * from t1 where a like "ABC%";
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a
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abc
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abcd
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select * from t1 where a like "test%";
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a
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test
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select * from t1 where a like "te_t";
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a
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test
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select * from t1 where a like "%a%";
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a
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a
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abc
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abcd
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select * from t1 where a like "%abcd%";
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a
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abcd
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select * from t1 where a like "%abc\d%";
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a
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abcd
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drop table t1;
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create table t1 (a varchar(10), key(a));
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insert into t1 values ('a'), ('a\\b');
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select * from t1 where a like 'a\\%' escape '#';
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a
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a\b
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select * from t1 where a like 'a\\%' escape '#' and a like 'a\\\\b';
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a
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a\b
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prepare stmt1 from 'select * from t1 where a like \'a\\%\' escape ?';
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set @esc='#';
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execute stmt1 using @esc;
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a
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a\b
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deallocate prepare stmt1;
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drop table t1;
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create table t1 (a datetime);
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insert into t1 values ('2004-03-11 12:00:21');
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select * from t1 where a like '2004-03-11 12:00:21';
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a
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2004-03-11 12:00:21
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drop table t1;
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SET NAMES koi8r;
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CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET koi8r);
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INSERT INTO t1 VALUES ('ÆÙ×Á'),('æÙ×Á'),('Æù×Á'),('ÆÙ÷Á'),('ÆÙ×á'),('æù÷á');
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INSERT INTO t1 VALUES ('ÆÙ×ÁÐÒÏÌÄÖ'),('æÙ×ÁÐÒÏÌÄÖ'),('Æù×ÁÐÒÏÌÄÖ'),('ÆÙ÷ÁÐÒÏÌÄÖ');
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INSERT INTO t1 VALUES ('ÆÙ×áÐÒÏÌÄÖ'),('ÆÙ×ÁðÒÏÌÄÖ'),('ÆÙ×ÁÐòÏÌÄÖ'),('ÆÙ×ÁÐÒïÌÄÖ');
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INSERT INTO t1 VALUES ('ÆÙ×ÁÐÒÏìÄÖ'),('ÆÙ×ÁÐÒÏÌäÖ'),('ÆÙ×ÁÐÒÏÌÄö'),('æù÷áðòïìäö');
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SELECT * FROM t1 WHERE a LIKE '%Æù×Á%';
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a
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ÆÙ×Á
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æÙ×Á
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Æù×Á
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ÆÙ÷Á
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ÆÙ×á
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æù÷á
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ÆÙ×ÁÐÒÏÌÄÖ
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æÙ×ÁÐÒÏÌÄÖ
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Æù×ÁÐÒÏÌÄÖ
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ÆÙ÷ÁÐÒÏÌÄÖ
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ÆÙ×áÐÒÏÌÄÖ
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ÆÙ×ÁðÒÏÌÄÖ
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ÆÙ×ÁÐòÏÌÄÖ
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ÆÙ×ÁÐÒïÌÄÖ
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ÆÙ×ÁÐÒÏìÄÖ
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ÆÙ×ÁÐÒÏÌäÖ
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ÆÙ×ÁÐÒÏÌÄö
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æù÷áðòïìäö
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SELECT * FROM t1 WHERE a LIKE '%Æù×%';
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a
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ÆÙ×Á
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æÙ×Á
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Æù×Á
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ÆÙ÷Á
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ÆÙ×á
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æù÷á
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ÆÙ×ÁÐÒÏÌÄÖ
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æÙ×ÁÐÒÏÌÄÖ
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Æù×ÁÐÒÏÌÄÖ
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ÆÙ÷ÁÐÒÏÌÄÖ
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ÆÙ×áÐÒÏÌÄÖ
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ÆÙ×ÁðÒÏÌÄÖ
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ÆÙ×ÁÐòÏÌÄÖ
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ÆÙ×ÁÐÒïÌÄÖ
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ÆÙ×ÁÐÒÏìÄÖ
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ÆÙ×ÁÐÒÏÌäÖ
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ÆÙ×ÁÐÒÏÌÄö
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æù÷áðòïìäö
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SELECT * FROM t1 WHERE a LIKE 'Æù×Á%';
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a
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ÆÙ×Á
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æÙ×Á
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Æù×Á
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ÆÙ÷Á
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ÆÙ×á
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æù÷á
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ÆÙ×ÁÐÒÏÌÄÖ
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æÙ×ÁÐÒÏÌÄÖ
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Æù×ÁÐÒÏÌÄÖ
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ÆÙ÷ÁÐÒÏÌÄÖ
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ÆÙ×áÐÒÏÌÄÖ
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ÆÙ×ÁðÒÏÌÄÖ
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ÆÙ×ÁÐòÏÌÄÖ
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ÆÙ×ÁÐÒïÌÄÖ
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ÆÙ×ÁÐÒÏìÄÖ
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ÆÙ×ÁÐÒÏÌäÖ
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ÆÙ×ÁÐÒÏÌÄö
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æù÷áðòïìäö
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DROP TABLE t1;
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SET NAMES cp1250;
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CREATE TABLE t1 (a varchar(250) NOT NULL) DEFAULT CHARACTER SET=cp1250;
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INSERT INTO t1 VALUES
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('Techni Tapes Sp. z o.o.'),
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('Pojazdy Szynowe PESA Bydgoszcz SA Holding'),
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('AKAPESTER 1 P.P.H.U.'),
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('Pojazdy Szynowe PESA Bydgoszcz S A Holding'),
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('PPUH PESKA-I Maria Struniarska');
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select * from t1 where a like '%PESA%';
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a
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Pojazdy Szynowe PESA Bydgoszcz SA Holding
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Pojazdy Szynowe PESA Bydgoszcz S A Holding
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select * from t1 where a like '%PESA %';
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a
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Pojazdy Szynowe PESA Bydgoszcz SA Holding
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Pojazdy Szynowe PESA Bydgoszcz S A Holding
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select * from t1 where a like '%PES%';
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a
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Techni Tapes Sp. z o.o.
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Pojazdy Szynowe PESA Bydgoszcz SA Holding
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AKAPESTER 1 P.P.H.U.
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Pojazdy Szynowe PESA Bydgoszcz S A Holding
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PPUH PESKA-I Maria Struniarska
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select * from t1 where a like '%PESKA%';
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a
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PPUH PESKA-I Maria Struniarska
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select * from t1 where a like '%ESKA%';
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a
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PPUH PESKA-I Maria Struniarska
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DROP TABLE t1;
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select _cp866'aaaaaaaaa' like _cp866'%aaaa%' collate cp866_bin;
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_cp866'aaaaaaaaa' like _cp866'%aaaa%' collate cp866_bin
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1
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set names koi8r;
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select 'andre%' like 'andreÊ%' escape 'Ê';
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'andre%' like 'andreÊ%' escape 'Ê'
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1
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select _cp1251'andre%' like convert('andreÊ%' using cp1251) escape 'Ê';
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_cp1251'andre%' like convert('andreÊ%' using cp1251) escape 'Ê'
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1
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End of 4.1 tests
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#
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# Bug #54575: crash when joining tables with unique set column
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#
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CREATE TABLE t1(a SET('a') NOT NULL, UNIQUE KEY(a));
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CREATE TABLE t2(b INT PRIMARY KEY);
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INSERT IGNORE INTO t1 VALUES ();
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Warnings:
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Warning 1364 Field 'a' doesn't have a default value
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INSERT INTO t2 VALUES (1), (2), (3);
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SELECT 1 FROM t2 JOIN t1 ON 1 LIKE a GROUP BY a;
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1
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DROP TABLE t1, t2;
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#
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# Bug#59149 valgrind warnings with "like .. escape .." function
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#
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SELECT '' LIKE '1' ESCAPE COUNT(1);
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ERROR HY000: Incorrect arguments to ESCAPE
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End of 5.1 tests
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#
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# Start of 10.0 tests
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#
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#
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# MDEV-5445 Server crashes in Item_func_like::fix_fields on LIKE ExtractValue(..)
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#
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SELECT 'a' LIKE REPEAT('',0);
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'a' LIKE REPEAT('',0)
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0
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SELECT 'a' LIKE EXTRACTVALUE('bar','qux');
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'a' LIKE EXTRACTVALUE('bar','qux')
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0
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#
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# End of 10.0 tests
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#
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#
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# Start of 10.1 tests
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#
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#
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# MDEV-8257 Erroneous "Impossible where" when mixing decimal comparison and LIKE
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#
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CREATE TABLE t1 (a DECIMAL(8,2));
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INSERT INTO t1 VALUES (10),(20);
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SELECT * FROM t1 WHERE a=10.0;
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a
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10.00
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SELECT * FROM t1 WHERE a LIKE 10.00;
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a
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10.00
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SELECT * FROM t1 WHERE a=10.0 AND a LIKE 10.00;
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a
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10.00
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EXPLAIN EXTENDED SELECT * FROM t1 WHERE a=10.0 AND a LIKE 10.00;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 10.0 and `test`.`t1`.`a` like 10.00
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DROP TABLE t1;
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#
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# MDEV-8599 "WHERE varchar_field LIKE temporal_const" does not use range optimizer
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#
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CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1, KEY(a)) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('00:00:00');
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INSERT INTO t1 VALUES ('00:00:01');
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INSERT INTO t1 VALUES ('00:00:02');
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INSERT INTO t1 VALUES ('00:00:03');
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INSERT INTO t1 VALUES ('00:00:04');
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INSERT INTO t1 VALUES ('00:00:05');
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INSERT INTO t1 VALUES ('00:00:06');
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INSERT INTO t1 VALUES ('00:00:07');
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EXPLAIN SELECT * FROM t1 WHERE a LIKE '00:00:00';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 13 NULL 1 Using where; Using index
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EXPLAIN SELECT * FROM t1 WHERE a LIKE TIME'00:00:00';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 13 NULL 1 Using where; Using index
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SELECT * FROM t1 WHERE a LIKE '00:00:00';
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a
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00:00:00
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SELECT * FROM t1 WHERE a LIKE TIME'00:00:00';
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a
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00:00:00
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DROP TABLE t1;
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#
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# End of 10.1 tests
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#
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create view v1 as select 'foo!' like 'foo!!', 'foo!' like 'foo!!' escape '!';
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show create view v1;
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View Create View character_set_client collation_connection
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v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 'foo!' like 'foo!!' AS `'foo!' like 'foo!!'`,'foo!' like 'foo!!' escape '!' AS `'foo!' like 'foo!!' escape '!'` koi8r koi8r_general_ci
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select * from v1;
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'foo!' like 'foo!!' 'foo!' like 'foo!!' escape '!'
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0 1
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drop view v1;
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create table t1 (a varchar(100),
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b int default (a like '%f\\_'),
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c int default (a like '%f\\_' escape ''),
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d int default (a like '%f\\_' escape '\\'));
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` varchar(100) DEFAULT NULL,
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`b` int(11) DEFAULT (`a` like '%f\\_'),
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`c` int(11) DEFAULT (`a` like '%f\\_' escape ''),
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`d` int(11) DEFAULT (`a` like '%f\\_' escape '\\')
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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insert t1 (a) values ('1 f_'), ('1 f\\_');
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set sql_mode=no_backslash_escapes;
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insert t1 (a) values ('2 f_'), ('2 f\_');
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flush tables;
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insert t1 (a) values ('3 f_'), ('3 f\_');
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set sql_mode=default;
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select * from t1;
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a b c d
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1 f_ 1 0 1
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1 f\_ 0 1 0
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2 f_ 1 0 1
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2 f\_ 0 1 0
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3 f_ 1 0 1
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3 f\_ 0 1 0
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drop table t1;
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#
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# MDEV-17359 - Extend expression supported by like (| & << >> || + - * / DIV MOD ^ )
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#
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SELECT 1 LIKE +1;
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1 LIKE +1
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1
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SELECT -1 LIKE -1;
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-1 LIKE -1
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1
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SELECT 1 LIKE (1);
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1 LIKE (1)
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1
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SELECT 1 LIKE 1|2, 3 LIKE 1|2;
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1 LIKE 1|2 3 LIKE 1|2
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0 1
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SELECT 1 LIKE 3&2, 2 LIKE 3&2;
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1 LIKE 3&2 2 LIKE 3&2
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0 1
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SELECT 1 LIKE 1>>0, 1 LIKE 1>>1 , 64 LIKE 256>>2;
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1 LIKE 1>>0 1 LIKE 1>>1 64 LIKE 256>>2
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1 0 1
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SELECT 1 LIKE 1<<0, 1 LIKE 0<<2, 32 LIKE 1<<5;
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1 LIKE 1<<0 1 LIKE 0<<2 32 LIKE 1<<5
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1 0 1
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SELECT 1 LIKE 1||2, 1 LIKE 0||2;
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1 LIKE 1||2 1 LIKE 0||2
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1 1
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SELECT 2 LIKE 1+1, 2.0 LIKE 1+1.0, 2 LIKE 1+1.0, 1+1 LIKE 2, 1+1 LIKE 0+2;
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2 LIKE 1+1 2.0 LIKE 1+1.0 2 LIKE 1+1.0 1+1 LIKE 2 1+1 LIKE 0+2
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1 1 0 1 1
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SELECT 0 LIKE 1-1, 2.0 LIKE 3-1.0, 2 LIKE 3-1.0, 2-1 LIKE 1, 3-1 LIKE 4-1;
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0 LIKE 1-1 2.0 LIKE 3-1.0 2 LIKE 3-1.0 2-1 LIKE 1 3-1 LIKE 4-1
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1 1 0 1 0
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SELECT 1 LIKE 1*1, 2.0 LIKE 2*1.0, 2 LIKE 2*1.0, 2*1 LIKE 2, 2*3 LIKE 6*1;
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1 LIKE 1*1 2.0 LIKE 2*1.0 2 LIKE 2*1.0 2*1 LIKE 2 2*3 LIKE 6*1
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1 1 0 1 1
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SELECT 1 LIKE 1/1, 1.0000 LIKE 1/1, 1.0000 LIKE 1/1.000000, 1.000000 LIKE 1.0/1.000000, 1/1 like 1/1;
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1 LIKE 1/1 1.0000 LIKE 1/1 1.0000 LIKE 1/1.000000 1.000000 LIKE 1.0/1.000000 1/1 like 1/1
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0 1 1 0 1
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SELECT 1 LIKE 1 DIV 1, 1 LIKE 1.0 DIV 1.0 ;
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1 LIKE 1 DIV 1 1 LIKE 1.0 DIV 1.0
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1 1
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SELECT 2 LIKE 10 MOD 8, 1.9 LIKE 10 MOD 8.1, 1.9 LIKE 10 MOD 8.10 ;
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2 LIKE 10 MOD 8 1.9 LIKE 10 MOD 8.1 1.9 LIKE 10 MOD 8.10
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1 1 0
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SELECT 1 LIKE CAST(1 AS CHAR(10));
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1 LIKE CAST(1 AS CHAR(10))
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1
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SELECT 1 LIKE CASE WHEN 1=1 THEN '1' ELSE '0' END;
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1 LIKE CASE WHEN 1=1 THEN '1' ELSE '0' END
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1
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SELECT 1 LIKE COALESCE(1+0, 1);
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1 LIKE COALESCE(1+0, 1)
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1
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CREATE TABLE t1(c1 INTEGER, c2 INTEGER);
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INSERT INTO t1 VALUES(1,1);
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INSERT INTO t1 VALUES(1,2);
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SELECT c1, c2, c1|c2, 1 LIKE c1|c2 FROM t1 ORDER BY c2;
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c1 c2 c1|c2 1 LIKE c1|c2
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1 1 1 1
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1 2 3 0
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SELECT c1, c2, c1&c2, 1 LIKE c1&c2 FROM t1 ORDER BY c2;
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c1 c2 c1&c2 1 LIKE c1&c2
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1 1 1 1
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1 2 0 0
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SELECT c1, c2, c2>>c1, 1 LIKE c2>>c1 FROM t1 ORDER BY c2;
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c1 c2 c2>>c1 1 LIKE c2>>c1
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1 1 0 0
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1 2 1 1
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SELECT c1, c2, c2<<c1, 2 LIKE c2<<c1 FROM t1 ORDER BY c2;
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c1 c2 c2<<c1 2 LIKE c2<<c1
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1 1 2 1
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1 2 4 0
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SELECT c1, c2, c1||c2, 1 LIKE c1||c2 FROM t1 ORDER BY c2;
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c1 c2 c1||c2 1 LIKE c1||c2
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1 1 1 1
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1 2 1 1
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SELECT c1, c2, c1+c2, 2 LIKE c1+c2 FROM t1 ORDER BY c2;
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c1 c2 c1+c2 2 LIKE c1+c2
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1 1 2 1
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1 2 3 0
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SELECT c1, c2, c1-c2, -1 LIKE c1-c2 FROM t1 ORDER BY c2;
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c1 c2 c1-c2 -1 LIKE c1-c2
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1 1 0 0
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1 2 -1 1
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SELECT c1, c2, c1*c2, 2 LIKE c1*c2 FROM t1 ORDER BY c2;
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c1 c2 c1*c2 2 LIKE c1*c2
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1 1 1 0
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1 2 2 1
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SELECT c1, c2, c1/c2, 0.5000 LIKE c1/c2 FROM t1 ORDER BY c2;
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c1 c2 c1/c2 0.5000 LIKE c1/c2
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1 1 1.0000 0
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1 2 0.5000 1
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SELECT c1, c2, c1 DIV c2, 0 LIKE c1 DIV c2 FROM t1 ORDER BY c2;
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c1 c2 c1 DIV c2 0 LIKE c1 DIV c2
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1 1 1 0
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1 2 0 1
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SELECT c1, c2, c1 MOD c2, 0 LIKE c1 MOD c2 FROM t1 ORDER BY c2;
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c1 c2 c1 MOD c2 0 LIKE c1 MOD c2
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1 1 0 1
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1 2 1 0
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CREATE VIEW v1 AS
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SELECT 1 LIKE c1|c2, 1 LIKE c1&c2, 1 LIKE c2>>c1, 2 LIKE c2<<c1,
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1 LIKE c1||c2, 2 LIKE c1+c2, -1 LIKE c1-c2, 2 LIKE c1*c2,
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0.5000 LIKE c1/c2, 0 LIKE c1 DIV c2, 0 LIKE c1 MOD c2
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FROM t1 ORDER BY c2;
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SELECT * FROM v1;
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1 LIKE c1|c2 1 LIKE c1&c2 1 LIKE c2>>c1 2 LIKE c2<<c1 1 LIKE c1||c2 2 LIKE c1+c2 -1 LIKE c1-c2 2 LIKE c1*c2 0.5000 LIKE c1/c2 0 LIKE c1 DIV c2 0 LIKE c1 MOD c2
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1 1 0 1 1 1 0 0 0 0 1
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0 0 1 0 1 0 1 1 1 1 0
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EXPLAIN EXTENDED SELECT * FROM v1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using filesort
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Warnings:
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Note 1003 select 1 like `test`.`t1`.`c1` | `test`.`t1`.`c2` AS `1 LIKE c1|c2`,1 like `test`.`t1`.`c1` & `test`.`t1`.`c2` AS `1 LIKE c1&c2`,1 like `test`.`t1`.`c2` >> `test`.`t1`.`c1` AS `1 LIKE c2>>c1`,2 like `test`.`t1`.`c2` << `test`.`t1`.`c1` AS `2 LIKE c2<<c1`,1 like `test`.`t1`.`c1` or `test`.`t1`.`c2` <> 0 AS `1 LIKE c1||c2`,2 like `test`.`t1`.`c1` + `test`.`t1`.`c2` AS `2 LIKE c1+c2`,-1 like `test`.`t1`.`c1` - `test`.`t1`.`c2` AS `-1 LIKE c1-c2`,2 like `test`.`t1`.`c1` * `test`.`t1`.`c2` AS `2 LIKE c1*c2`,0.5000 like `test`.`t1`.`c1` / `test`.`t1`.`c2` AS `0.5000 LIKE c1/c2`,0 like `test`.`t1`.`c1` DIV `test`.`t1`.`c2` AS `0 LIKE c1 DIV c2`,0 like `test`.`t1`.`c1` MOD `test`.`t1`.`c2` AS `0 LIKE c1 MOD c2` from `test`.`t1` order by `test`.`t1`.`c2`
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DROP VIEW v1;
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DROP TABLE t1;
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