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669ce69483
"rows examined" estimates". This change implements "innodb_stats_method"
with options of "nulls_equal", "nulls_unequal" and "null_ignored".
rb://553 approved by Marko
212 lines
6.4 KiB
Plaintext
212 lines
6.4 KiB
Plaintext
# Test for Bug #30423, InnoDBs treatment of NULL in index stats causes
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# bad "rows examined" estimates.
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# Implemented InnoDB system variable "innodb_stats_method" with
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# "nulls_equal" (default), "nulls_unequal", and "nulls_ignored" options.
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-- source include/have_innodb_plugin.inc
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let $innodb_stats_method_orig = `select @@innodb_stats_method`;
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# default setting for innodb_stats_method is "nulls_equal"
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set global innodb_stats_method = default;
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select @@innodb_stats_method;
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# create three tables, bug30243_1, bug30243_2 and bug30243_3.
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# The test scenario is adopted from original bug #30423 report.
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# table bug30243_1 and bug30243_3 have many NULL values
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-- disable_result_log
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-- disable_query_log
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DROP TABLE IF EXISTS bug30243_1;
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CREATE TABLE bug30243_1 (
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org_id int(11) NOT NULL default '0',
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UNIQUE KEY (org_id)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1;
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LOCK TABLES bug30243_1 WRITE;
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INSERT INTO bug30243_1 VALUES (11),(15),(16),(17),(19),(20),(21),(23),(24),
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(25),(26),(27),(28),(29),(30),(31),(32),(33),(34),(35),(37),(38),(40),(41),
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(42),(43),(44),(45),(46),(47),(48),(49),(50),(51),(52),(53),(54),(55),(56),
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(57),(58),(59),(60),(61),(62),(63),(64),(65),(66),(67),(68),(69),(70),(71),
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(72),(73),(74),(75),(76),(77),(78),(79),(80),(81),(82),(83),(84),(85),(86),
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(87),(88),(89),(90),(91),(92),(93),(94),(95),(96),(97),(98),(99),(100),(101),
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(102),(103),(104),(105),(106),(107),(108),(109),(110),(111),(112),(113),(114),
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(115),(116),(117),(118),(119),(120),(121),(122),(123),(124),(125),(126),(127),
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(128),(129),(130),(131),(132),(133),(134),(135),(136),(137),(138),(139),(140),
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(141),(142),(143),(144),(145);
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UNLOCK TABLES;
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DROP TABLE IF EXISTS bug30243_3;
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CREATE TABLE bug30243_3 (
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org_id int(11) default NULL,
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KEY (org_id)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1;
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INSERT INTO bug30243_3 VALUES (NULL);
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begin;
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let $i=14;
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while ($i)
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{
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INSERT INTO bug30243_3 SELECT NULL FROM bug30243_3;
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dec $i;
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}
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INSERT INTO bug30243_3 VALUES (34),(34),(35),(56),(58),(62),(62),(64),(65),(66),(80),(135),(137),(138),(139),(140),(142),(143),(144),(145);
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commit;
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DROP TABLE IF EXISTS bug30243_2;
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CREATE TABLE bug30243_2 (
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org_id int(11) default NULL,
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KEY `contacts$org_id` (org_id)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1;
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INSERT INTO bug30243_2 VALUES (NULL);
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begin;
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let $i=16;
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while ($i)
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{
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INSERT INTO bug30243_2 SELECT NULL FROM bug30243_2;
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dec $i;
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}
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INSERT INTO bug30243_2 VALUES (11),(15),(16),(17),(20),(21),(23),(24),(25),
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(26),(27),(28),(29),(30),(31),(32),(33),(34),(37),(38),(40),(41),(42),(43),
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(44),(45),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
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(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
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(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
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(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
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(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),
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(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(46),(48),
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(48),(50),(51),(52),(52),(53),(54),(55),(57),(60),(61),(62),(62),(62),(62),
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(62),(63),(64),(64),(65),(66),(66),(67),(68),(69),(70),(71),(72),(73),(74),
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(75),(76),(77),(78),(79),(80),(80),(81),(82),(83),(84),(85),(86),(87),(88),
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(89),(90),(91),(92),(93),(94),(95),(96),(97),(98),(99),(100),(101),(102),
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(103),(104),(105),(106),(107),(108),(109),(110),(111),(112),(113),(114),
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(115),(116),(117),(118),(119),(120),(121),(122),(123),(124),(125),(126),
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(127),(128),(129),(130),(131),(132),(133),(133),(135),(135),(135),(135),
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(136),(136),(138),(138),(139),(139),(139),(140),(141),(141),(142),(143),
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(143),(145),(145);
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commit;
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-- enable_result_log
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-- enable_query_log
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# check tables's value
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select count(*) from bug30243_3 where org_id is not NULL;
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select count(*) from bug30243_3 where org_id is NULL;
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select count(*) from bug30243_2 where org_id is not NULL;
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select count(*) from bug30243_2 where org_id is NULL;
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select @@innodb_stats_method;
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analyze table bug30243_1;
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analyze table bug30243_2;
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analyze table bug30243_3;
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# Following query plan shows that we over estimate the rows per
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# unique value (since there are many NULLs).
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# Skip this query log since the stats estimate could vary from runs
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-- disable_query_log
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-- disable_result_log
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explain SELECT COUNT(*), 0
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FROM bug30243_1 orgs
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LEFT JOIN bug30243_3 sa_opportunities
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ON orgs.org_id=sa_opportunities.org_id
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LEFT JOIN bug30243_2 contacts
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ON orgs.org_id=contacts.org_id ;
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-- enable_query_log
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-- enable_result_log
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# following set operation will fail
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#--error ER_WRONG_VALUE_FOR_VAR
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--error 1231
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set global innodb_stats_method = "NULL";
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set global innodb_stats_method = "nulls_ignored";
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select @@innodb_stats_method;
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# Regenerate the stats with "nulls_ignored" option
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analyze table bug30243_1;
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analyze table bug30243_2;
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analyze table bug30243_3;
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# Following query plan shows that we get the correct rows per
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# unique value (should be approximately 1 row per value)
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explain SELECT COUNT(*), 0
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FROM bug30243_1 orgs
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LEFT JOIN bug30243_3 sa_opportunities
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ON orgs.org_id=sa_opportunities.org_id
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LEFT JOIN bug30243_2 contacts
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ON orgs.org_id=contacts.org_id ;
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select @@innodb_stats_method;
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# Try the "nulls_unequal" option
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set global innodb_stats_method = "nulls_unequal";
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select @@innodb_stats_method;
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analyze table bug30243_1;
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analyze table bug30243_2;
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analyze table bug30243_3;
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# Following query plan shows that we get the correct rows per
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# unique value (~1)
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explain SELECT COUNT(*), 0
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FROM bug30243_1 orgs
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LEFT JOIN bug30243_3 sa_opportunities
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ON orgs.org_id=sa_opportunities.org_id
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LEFT JOIN bug30243_2 contacts
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ON orgs.org_id=contacts.org_id;
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# Create a table with all NULL values, make sure the stats calculation
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# does not crash with table of all NULL values
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-- disable_query_log
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CREATE TABLE table_bug30423 (
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org_id int(11) default NULL,
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KEY(org_id)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1;
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INSERT INTO `table_bug30423` VALUES (NULL);
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begin;
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let $i=10;
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while ($i)
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{
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INSERT INTO table_bug30423 SELECT NULL FROM table_bug30423;
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dec $i;
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}
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commit;
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-- enable_query_log
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SELECT COUNT(*) FROM table_bug30423 WHERE org_id IS NULL;
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# calculate the statistics for the table for "nulls_ignored" and
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# "nulls_unequal" option
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set global innodb_stats_method = "nulls_unequal";
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analyze table table_bug30423;
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set global innodb_stats_method = "nulls_ignored";
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analyze table table_bug30423;
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eval set global innodb_stats_method = $innodb_stats_method_orig;
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drop table bug30243_2;
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drop table bug30243_1;
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drop table bug30243_3;
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drop table table_bug30423;
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