mirror of
https://github.com/MariaDB/server.git
synced 2025-01-30 18:41:56 +01:00
76f0b94bb0
sql/sql_insert.cc: CREATE ... IF NOT EXISTS may do nothing, but it is still not a failure. don't forget to my_ok it. ****** CREATE ... IF NOT EXISTS may do nothing, but it is still not a failure. don't forget to my_ok it. sql/sql_table.cc: small cleanup ****** small cleanup
209 lines
6.3 KiB
Text
209 lines
6.3 KiB
Text
# Test for Bug #30423, InnoDBs treatment of NULL in index stats causes
|
|
# bad "rows examined" estimates.
|
|
# Implemented InnoDB system variable "innodb_stats_method" with
|
|
# "nulls_equal" (default), "nulls_unequal", and "nulls_ignored" options.
|
|
|
|
let $innodb_stats_method_orig = `select @@innodb_stats_method`;
|
|
|
|
# default setting for innodb_stats_method is "nulls_equal"
|
|
set global innodb_stats_method = default;
|
|
|
|
select @@innodb_stats_method;
|
|
|
|
# create three tables, bug30243_1, bug30243_2 and bug30243_3.
|
|
# The test scenario is adopted from original bug #30423 report.
|
|
# table bug30243_1 and bug30243_3 have many NULL values
|
|
|
|
-- disable_result_log
|
|
-- disable_query_log
|
|
|
|
DROP TABLE IF EXISTS bug30243_1;
|
|
CREATE TABLE bug30243_1 (
|
|
org_id int(11) NOT NULL default '0',
|
|
UNIQUE KEY (org_id)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
|
|
|
|
LOCK TABLES bug30243_1 WRITE;
|
|
INSERT INTO bug30243_1 VALUES (11),(15),(16),(17),(19),(20),(21),(23),(24),
|
|
(25),(26),(27),(28),(29),(30),(31),(32),(33),(34),(35),(37),(38),(40),(41),
|
|
(42),(43),(44),(45),(46),(47),(48),(49),(50),(51),(52),(53),(54),(55),(56),
|
|
(57),(58),(59),(60),(61),(62),(63),(64),(65),(66),(67),(68),(69),(70),(71),
|
|
(72),(73),(74),(75),(76),(77),(78),(79),(80),(81),(82),(83),(84),(85),(86),
|
|
(87),(88),(89),(90),(91),(92),(93),(94),(95),(96),(97),(98),(99),(100),(101),
|
|
(102),(103),(104),(105),(106),(107),(108),(109),(110),(111),(112),(113),(114),
|
|
(115),(116),(117),(118),(119),(120),(121),(122),(123),(124),(125),(126),(127),
|
|
(128),(129),(130),(131),(132),(133),(134),(135),(136),(137),(138),(139),(140),
|
|
(141),(142),(143),(144),(145);
|
|
UNLOCK TABLES;
|
|
|
|
DROP TABLE IF EXISTS bug30243_3;
|
|
CREATE TABLE bug30243_3 (
|
|
org_id int(11) default NULL,
|
|
KEY (org_id)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
|
|
|
|
INSERT INTO bug30243_3 VALUES (NULL);
|
|
|
|
begin;
|
|
let $i=14;
|
|
while ($i)
|
|
{
|
|
INSERT INTO bug30243_3 SELECT NULL FROM bug30243_3;
|
|
dec $i;
|
|
}
|
|
|
|
INSERT INTO bug30243_3 VALUES (34),(34),(35),(56),(58),(62),(62),(64),(65),(66),(80),(135),(137),(138),(139),(140),(142),(143),(144),(145);
|
|
commit;
|
|
|
|
DROP TABLE IF EXISTS bug30243_2;
|
|
CREATE TABLE bug30243_2 (
|
|
org_id int(11) default NULL,
|
|
KEY `contacts$org_id` (org_id)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
|
|
|
|
INSERT INTO bug30243_2 VALUES (NULL);
|
|
|
|
begin;
|
|
let $i=16;
|
|
while ($i)
|
|
{
|
|
INSERT INTO bug30243_2 SELECT NULL FROM bug30243_2;
|
|
dec $i;
|
|
}
|
|
|
|
INSERT INTO bug30243_2 VALUES (11),(15),(16),(17),(20),(21),(23),(24),(25),
|
|
(26),(27),(28),(29),(30),(31),(32),(33),(34),(37),(38),(40),(41),(42),(43),
|
|
(44),(45),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
|
|
(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
|
|
(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
|
|
(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
|
|
(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
|
|
(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(48),
|
|
(48),(50),(51),(52),(52),(53),(54),(55),(57),(60),(61),(62),(62),(62),(62),
|
|
(62),(63),(64),(64),(65),(66),(66),(67),(68),(69),(70),(71),(72),(73),(74),
|
|
(75),(76),(77),(78),(79),(80),(80),(81),(82),(83),(84),(85),(86),(87),(88),
|
|
(89),(90),(91),(92),(93),(94),(95),(96),(97),(98),(99),(100),(101),(102),
|
|
(103),(104),(105),(106),(107),(108),(109),(110),(111),(112),(113),(114),
|
|
(115),(116),(117),(118),(119),(120),(121),(122),(123),(124),(125),(126),
|
|
(127),(128),(129),(130),(131),(132),(133),(133),(135),(135),(135),(135),
|
|
(136),(136),(138),(138),(139),(139),(139),(140),(141),(141),(142),(143),
|
|
(143),(145),(145);
|
|
commit;
|
|
|
|
|
|
-- enable_result_log
|
|
-- enable_query_log
|
|
|
|
# check tables's value
|
|
select count(*) from bug30243_3 where org_id is not NULL;
|
|
select count(*) from bug30243_3 where org_id is NULL;
|
|
|
|
select count(*) from bug30243_2 where org_id is not NULL;
|
|
select count(*) from bug30243_2 where org_id is NULL;
|
|
|
|
select @@innodb_stats_method;
|
|
|
|
analyze table bug30243_1;
|
|
analyze table bug30243_2;
|
|
analyze table bug30243_3;
|
|
|
|
# Following query plan shows that we over estimate the rows per
|
|
# unique value (since there are many NULLs).
|
|
# Skip this query log since the stats estimate could vary from runs
|
|
-- disable_query_log
|
|
-- disable_result_log
|
|
explain SELECT COUNT(*), 0
|
|
FROM bug30243_1 orgs
|
|
LEFT JOIN bug30243_3 sa_opportunities
|
|
ON orgs.org_id=sa_opportunities.org_id
|
|
LEFT JOIN bug30243_2 contacts
|
|
ON orgs.org_id=contacts.org_id ;
|
|
-- enable_query_log
|
|
-- enable_result_log
|
|
|
|
# following set operation will fail
|
|
#--error ER_WRONG_VALUE_FOR_VAR
|
|
--error 1231
|
|
set global innodb_stats_method = "NULL";
|
|
|
|
set global innodb_stats_method = "nulls_ignored";
|
|
|
|
select @@innodb_stats_method;
|
|
|
|
# Regenerate the stats with "nulls_ignored" option
|
|
|
|
analyze table bug30243_1;
|
|
analyze table bug30243_2;
|
|
analyze table bug30243_3;
|
|
|
|
# Following query plan shows that we get the correct rows per
|
|
# unique value (should be approximately 1 row per value)
|
|
explain SELECT COUNT(*), 0
|
|
FROM bug30243_1 orgs
|
|
LEFT JOIN bug30243_3 sa_opportunities
|
|
ON orgs.org_id=sa_opportunities.org_id
|
|
LEFT JOIN bug30243_2 contacts
|
|
ON orgs.org_id=contacts.org_id ;
|
|
|
|
select @@innodb_stats_method;
|
|
|
|
# Try the "nulls_unequal" option
|
|
set global innodb_stats_method = "nulls_unequal";
|
|
|
|
select @@innodb_stats_method;
|
|
|
|
analyze table bug30243_1;
|
|
analyze table bug30243_2;
|
|
analyze table bug30243_3;
|
|
|
|
# Following query plan shows that we get the correct rows per
|
|
# unique value (~1)
|
|
explain SELECT COUNT(*), 0
|
|
FROM bug30243_1 orgs
|
|
LEFT JOIN bug30243_3 sa_opportunities
|
|
ON orgs.org_id=sa_opportunities.org_id
|
|
LEFT JOIN bug30243_2 contacts
|
|
ON orgs.org_id=contacts.org_id;
|
|
|
|
|
|
# Create a table with all NULL values, make sure the stats calculation
|
|
# does not crash with table of all NULL values
|
|
-- disable_query_log
|
|
CREATE TABLE table_bug30423 (
|
|
org_id int(11) default NULL,
|
|
KEY(org_id)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
|
|
|
|
INSERT INTO `table_bug30423` VALUES (NULL);
|
|
|
|
begin;
|
|
let $i=10;
|
|
while ($i)
|
|
{
|
|
INSERT INTO table_bug30423 SELECT NULL FROM table_bug30423;
|
|
dec $i;
|
|
}
|
|
commit;
|
|
|
|
-- enable_query_log
|
|
|
|
SELECT COUNT(*) FROM table_bug30423 WHERE org_id IS NULL;
|
|
|
|
# calculate the statistics for the table for "nulls_ignored" and
|
|
# "nulls_unequal" option
|
|
set global innodb_stats_method = "nulls_unequal";
|
|
analyze table table_bug30423;
|
|
|
|
set global innodb_stats_method = "nulls_ignored";
|
|
analyze table table_bug30423;
|
|
|
|
|
|
eval set global innodb_stats_method = $innodb_stats_method_orig;
|
|
|
|
drop table bug30243_2;
|
|
|
|
drop table bug30243_1;
|
|
|
|
drop table bug30243_3;
|
|
|
|
drop table table_bug30423;
|