mirror of
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522 lines
20 KiB
Text
522 lines
20 KiB
Text
#
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# LP BUG#643424 valgrind warning in choose_subquery_plan()
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#
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CREATE TABLE t1 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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c1 int(11) DEFAULT NULL,
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c2 int(11) DEFAULT NULL,
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PRIMARY KEY (pk),
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KEY c2 (c2));
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INSERT INTO t1 VALUES (1,NULL,2);
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INSERT INTO t1 VALUES (2,7,9);
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INSERT INTO t1 VALUES (9,NULL,8);
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CREATE TABLE t2 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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c1 int(11) DEFAULT NULL,
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c2 int(11) DEFAULT NULL,
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PRIMARY KEY (pk),
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KEY c2 (c2));
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INSERT INTO t2 VALUES (1,1,7);
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set @save_optimizer_switch=@@optimizer_switch;
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set @@optimizer_switch='materialization=on,in_to_exists=on,semijoin=off';
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SELECT pk FROM t1 WHERE (c2, c1) IN (SELECT c2, c2 FROM t2);
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pk
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set session optimizer_switch=@save_optimizer_switch;
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drop table t1, t2;
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#
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# LP BUG#652727 Crash in create_ref_for_key()
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#
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CREATE TABLE t2 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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c1 int(11) DEFAULT NULL,
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PRIMARY KEY (pk));
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INSERT INTO t2 VALUES (10,7);
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INSERT INTO t2 VALUES (11,1);
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INSERT INTO t2 VALUES (17,NULL);
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CREATE TABLE t1 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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c1 int(11) DEFAULT NULL,
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PRIMARY KEY (pk));
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INSERT INTO t1 VALUES (15,1);
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INSERT INTO t1 VALUES (19,NULL);
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CREATE TABLE t3 (c2 int(11) DEFAULT NULL, KEY c2 (c2));
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INSERT INTO t3 VALUES (1);
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set @save_optimizer_switch=@@optimizer_switch;
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set @@optimizer_switch='materialization=on,in_to_exists=on,semijoin=off';
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SELECT c2
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FROM t3
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WHERE (2, 6) IN (SELECT t1.c1, t1.c1 FROM t1 STRAIGHT_JOIN t2 ON t2.pk = t1.pk);
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c2
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set session optimizer_switch=@save_optimizer_switch;
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drop table t1, t2, t3;
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#
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# LP BUG#641245 Crash in Item_equal::contains
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#
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CREATE TABLE t1 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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c1 int(11) DEFAULT NULL,
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c2 int(11) DEFAULT NULL,
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c3 varchar(1) DEFAULT NULL,
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c4 varchar(1) DEFAULT NULL,
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PRIMARY KEY (pk),
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KEY c2 (c2),
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KEY c3 (c3,c2));
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INSERT INTO t1 VALUES (10,7,8,'v','v');
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INSERT INTO t1 VALUES (11,1,9,'r','r');
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INSERT INTO t1 VALUES (12,5,9,'a','a');
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INSERT INTO t1 VALUES (13,7,18,'v','v');
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INSERT INTO t1 VALUES (14,1,19,'r','r');
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INSERT INTO t1 VALUES (15,5,29,'a','a');
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INSERT INTO t1 VALUES (17,7,38,'v','v');
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INSERT INTO t1 VALUES (18,1,39,'r','r');
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INSERT INTO t1 VALUES (19,5,49,'a','a');
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create table t1a like t1;
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insert into t1a select * from t1;
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create table t1b like t1;
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insert into t1b select * from t1;
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CREATE TABLE t2 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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c1 int(11) DEFAULT NULL,
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c2 int(11) DEFAULT NULL,
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c3 varchar(1) DEFAULT NULL,
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c4 varchar(1) DEFAULT NULL,
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PRIMARY KEY (pk),
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KEY c2 (c2),
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KEY c3 (c3,c2));
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INSERT INTO t2 VALUES (1,NULL,2,'w','w');
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INSERT INTO t2 VALUES (2,7,9,'m','m');
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set @@optimizer_switch='materialization=off,in_to_exists=on,semijoin=off';
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EXPLAIN EXTENDED SELECT pk
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FROM t1
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WHERE c1 IN
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(SELECT t1a.c1
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FROM (t1b JOIN t2 ON t2.c3 = t1b.c4) LEFT JOIN
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t1a ON (t1a.c2 = t1b.pk AND 2)
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WHERE t1.pk) ;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 9 100.00 Using where
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2 DEPENDENT SUBQUERY t1b ALL NULL NULL NULL NULL 9 100.00
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2 DEPENDENT SUBQUERY t1a ref c2 c2 5 test.t1b.pk 1 100.00 Using where
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2 DEPENDENT SUBQUERY t2 index c3 c3 9 NULL 2 100.00 Using where; Using index; Using join buffer (flat, BNL join)
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Warnings:
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Note 1276 Field or reference 'test.t1.pk' of SELECT #2 was resolved in SELECT #1
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Note 1003 /* select#1 */ select `test`.`t1`.`pk` AS `pk` from `test`.`t1` where <expr_cache><`test`.`t1`.`c1`,`test`.`t1`.`pk`>(<in_optimizer>(`test`.`t1`.`c1`,<exists>(/* select#2 */ select `test`.`t1a`.`c1` from `test`.`t1b` join `test`.`t2` left join `test`.`t1a` on(`test`.`t1a`.`c2` = `test`.`t1b`.`pk` and 2) where `test`.`t2`.`c3` = `test`.`t1b`.`c4` and `test`.`t1`.`pk` <> 0 and <cache>(`test`.`t1`.`c1`) = `test`.`t1a`.`c1`)))
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SELECT pk
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FROM t1
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WHERE c1 IN
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(SELECT t1a.c1
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FROM (t1b JOIN t2 ON t2.c3 = t1b.c4) LEFT JOIN
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t1a ON (t1a.c2 = t1b.pk AND 2)
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WHERE t1.pk) ;
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pk
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DROP TABLE t1, t1a, t1b, t2;
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#
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# LP BUG#714808 Assertion `outer_lookup_keys <= outer_record_count'
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# failed with materialization
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CREATE TABLE t1 ( pk int(11), PRIMARY KEY (pk)) ;
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CREATE TABLE t2 ( f2 int(11)) ;
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CREATE TABLE t3 ( f1 int(11), f3 varchar(1), KEY (f1)) ;
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INSERT INTO t3 VALUES (7,'f');
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set @@optimizer_switch='materialization=on,in_to_exists=on,semijoin=off';
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EXPLAIN
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SELECT t1.*
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FROM t3 RIGHT JOIN t1 ON t1.pk = t3.f1
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WHERE t3.f3 OR ( 3 ) IN ( SELECT f2 FROM t2 );
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
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SELECT t1.*
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FROM t3 RIGHT JOIN t1 ON t1.pk = t3.f1
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WHERE t3.f3 OR ( 3 ) IN ( SELECT f2 FROM t2 );
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pk
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drop table t1,t2,t3;
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#
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# LP BUG#714999 Second crash in select_describe() with nested subqueries
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#
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CREATE TABLE t1 ( pk int(11)) ;
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INSERT INTO t1 VALUES (29);
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CREATE TABLE t2 ( f1 varchar(1)) ;
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INSERT INTO t2 VALUES ('f'),('d');
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CREATE TABLE t3 ( f2 varchar(1)) ;
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EXPLAIN SELECT f2 FROM t3 WHERE (
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SELECT MAX( pk ) FROM t1
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WHERE EXISTS (
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SELECT max(f1)
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FROM t2 GROUP BY f1
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)
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) IS NULL ;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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2 SUBQUERY t1 system NULL NULL NULL NULL 1
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3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using temporary
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drop table t1, t2, t3;
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#
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# LP BUG#715034 Item_sum_distinct::clear(): Assertion `tree != 0' failed
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#
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CREATE TABLE t2 ( f2 int(11)) ;
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CREATE TABLE t1 ( f3 int(11), KEY (f3)) ;
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INSERT INTO t1 VALUES (6),(4);
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set @tmp_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='derived_merge=off,derived_with_keys=off';
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EXPLAIN
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SELECT * FROM (SELECT * FROM t2) AS a2
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WHERE (SELECT distinct SUM(distinct f3 ) FROM t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> system NULL NULL NULL NULL 0 Const row not found
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3 SUBQUERY t1 index NULL f3 5 NULL 2 Using index
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2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table
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insert into t2 values (1),(2);
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EXPLAIN
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SELECT * FROM (SELECT * FROM t2) AS a2
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WHERE (SELECT distinct SUM(distinct f3 ) FROM t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2
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3 SUBQUERY t1 index NULL f3 5 NULL 2 Using index
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2 DERIVED t2 ALL NULL NULL NULL NULL 2
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set optimizer_switch=@tmp_optimizer_switch;
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drop table t1,t2;
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#
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# LP BUG#715027 Assertion `!table || (!table->read_set || bitmap_is_set(table->read_set, field_index))' failed
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#
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CREATE TABLE t1 ( f1 int(11), PRIMARY KEY (f1)) ;
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INSERT INTO t1 VALUES (28),(29);
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CREATE TABLE t2 ( f2 int(11), f3 int(11), f10 varchar(1)) ;
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INSERT INTO t2 VALUES (NULL,6,'f'),(4,2,'d');
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set @tmp_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='derived_merge=off,derived_with_keys=off';
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EXPLAIN
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SELECT alias2.f2 AS field1
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FROM t1 AS alias1 JOIN ( SELECT * FROM t2 ) AS alias2 ON alias2.f3 = alias1.f1
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WHERE (
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SELECT t2.f2
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FROM t2 JOIN t1 ON (t1.f1>0 or t1.f1<0)
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WHERE (t1.f1>0 or t1.f1<0) AND alias2.f10
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)
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ORDER BY field1 ;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where; Using filesort
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1 PRIMARY alias1 eq_ref PRIMARY PRIMARY 4 alias2.f3 1 Using index
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3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2
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3 DEPENDENT SUBQUERY t1 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index; Using join buffer (flat, BNL join)
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2 DERIVED t2 ALL NULL NULL NULL NULL 2
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SELECT alias2.f2 AS field1
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FROM t1 AS alias1 JOIN ( SELECT * FROM t2 ) AS alias2 ON alias2.f3 = alias1.f1
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WHERE (
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SELECT t2.f2
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FROM t2 JOIN t1 ON (t1.f1>0 or t1.f1<0)
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WHERE (t1.f1>0 or t1.f1<0) AND alias2.f10
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)
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ORDER BY field1 ;
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field1
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Warnings:
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Warning 1292 Truncated incorrect DECIMAL value: 'f'
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Warning 1292 Truncated incorrect DECIMAL value: 'd'
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set optimizer_switch=@tmp_optimizer_switch;
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drop table t1,t2;
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#
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# LP BUG#718578 Yet another Assertion `!table ||
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# (!table->read_set || bitmap_is_set(table->read_set, field_index))'
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CREATE TABLE t1 ( f1 int(11), f2 int(11), f3 int(11)) ;
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INSERT IGNORE INTO t1 VALUES (28,5,6),(29,NULL,4);
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CREATE TABLE t2 ( f10 varchar(1) );
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INSERT IGNORE INTO t2 VALUES (NULL);
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SELECT f1 AS field1
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FROM ( SELECT * FROM t1 ) AS alias1
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WHERE (SELECT t1.f1
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FROM t2 JOIN t1 ON t1.f2
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WHERE alias1.f3 AND t1.f3) AND f2
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ORDER BY field1;
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field1
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28
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drop table t1,t2;
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#
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# LP BUG#601124 Bug in eliminate_item_equal
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# leads to crash in Item_func::Item_func
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CREATE TABLE t1 ( f1 int(11), f3 varchar(1)) ;
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INSERT INTO t1 VALUES (5,'m'),(NULL,'c');
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CREATE TABLE t2 ( f2 int(11), f3 varchar(1)) ;
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INSERT INTO t2 VALUES (6,'f'),(2,'d');
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CREATE TABLE t3 ( f2 int(11), f3 varchar(1)) ;
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INSERT INTO t3 VALUES (6,'f'),(2,'d');
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SELECT * FROM t3
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WHERE ( f2 ) IN (SELECT t1.f1
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FROM t1 STRAIGHT_JOIN t2 ON t2.f3 = t1.f3
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WHERE t2.f3 = 'c');
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f2 f3
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drop table t1,t2,t3;
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#
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# LP BUG#718593 Crash in substitute_for_best_equal_field -> eliminate_item_equal ->
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# Item_field::find_item_equal -> Item_equal::contains
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#
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set @save_optimizer_switch=@@optimizer_switch;
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SET @@optimizer_switch = 'semijoin=off';
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CREATE TABLE t1 ( f3 int(11), f10 varchar(1), f11 varchar(1)) ;
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INSERT IGNORE INTO t1 VALUES (6,'f','f'),(2,'d','d');
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CREATE TABLE t2 ( f12 int(11), f13 int(11)) ;
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insert into t2 values (1,2), (3,4);
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EXPLAIN
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SELECT * FROM t2
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WHERE ( f12 ) IN (
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SELECT alias2.f3
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FROM t1 AS alias1 JOIN t1 AS alias2 ON alias2.f10 = alias1.f11
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WHERE alias1.f11 OR alias1.f3 = 50 AND alias1.f10
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);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
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2 MATERIALIZED alias1 ALL NULL NULL NULL NULL 2 Using where
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2 MATERIALIZED alias2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
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SELECT * FROM t2
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WHERE ( f12 ) IN (
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SELECT alias2.f3
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FROM t1 AS alias1 JOIN t1 AS alias2 ON alias2.f10 = alias1.f11
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WHERE alias1.f11 OR alias1.f3 = 50 AND alias1.f10
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);
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f12 f13
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Warnings:
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Warning 1292 Truncated incorrect DECIMAL value: 'f'
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Warning 1292 Truncated incorrect DECIMAL value: 'd'
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EXPLAIN
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SELECT * FROM t2
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WHERE ( f12 ) IN (
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SELECT alias2.f3
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FROM t1 AS alias1, t1 AS alias2
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WHERE (alias2.f10 = alias1.f11) AND (alias1.f11 OR alias1.f3 = 50 AND alias1.f10));
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
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2 MATERIALIZED alias1 ALL NULL NULL NULL NULL 2 Using where
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2 MATERIALIZED alias2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
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SELECT * FROM t2
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WHERE ( f12 ) IN (
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SELECT alias2.f3
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FROM t1 AS alias1, t1 AS alias2
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WHERE (alias2.f10 = alias1.f11) AND (alias1.f11 OR alias1.f3 = 50 AND alias1.f10));
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f12 f13
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Warnings:
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Warning 1292 Truncated incorrect DECIMAL value: 'f'
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Warning 1292 Truncated incorrect DECIMAL value: 'd'
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set @@optimizer_switch=@save_optimizer_switch;
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drop table t1, t2;
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#
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# MWL#89: test introduced after Sergey Petrunia's review - test that
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# keyparts wihtout index prefix are used with the IN-EXISTS strategy.
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#
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create table t1 (c1 int);
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insert into t1 values (1), (2), (3);
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create table t2 (kp1 int, kp2 int, c2 int, filler char(100));
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insert into t2 values (0,0,0,'filler'),(0,1,1,'filler'),(0,2,2,'filler'),(0,3,3,'filler');
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create index key1 on t2 (kp1, kp2);
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create index key2 on t2 (kp1);
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create index key3 on t2 (kp2);
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SET @@optimizer_switch='materialization=off,semijoin=off,in_to_exists=on';
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analyze table t2;
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Table Op Msg_type Msg_text
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test.t2 analyze status Engine-independent statistics collected
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test.t2 analyze status OK
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explain
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select c1 from t1 where c1 in (select kp1 from t2 where kp2 = 10 and c2 = 4) or c1 > 7;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
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2 DEPENDENT SUBQUERY t2 index_subquery key1,key2,key3 key1 10 func,const 1 Using where
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select c1 from t1 where c1 in (select kp1 from t2 where kp2 = 10 and c2 = 4) or c1 > 7;
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c1
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set @@optimizer_switch='default';
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drop table t1, t2;
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#
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# LP BUG#800679: Assertion `outer_join->table_count > 0' failed in
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# JOIN::choose_subquery_plan() with materialization=on,semijoin=off
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#
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CREATE TABLE t1 ( f1 int);
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insert into t1 values (1),(2);
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CREATE TABLE t2 ( f1 int);
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insert into t2 values (1),(2);
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SET @@optimizer_switch='materialization=on,semijoin=off';
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EXPLAIN
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SELECT * FROM t1
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WHERE (f1) IN (SELECT f1 FROM t2)
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LIMIT 0;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Zero limit
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2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
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SELECT * FROM t1
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WHERE (f1) IN (SELECT f1 FROM t2)
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LIMIT 0;
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f1
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set @@optimizer_switch='default';
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drop table t1, t2;
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#
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# LP BUG#834492: Crash in fix_semijoin_strategies_for_picked_join_order
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# with nested subqueries and LooseScan=ON
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#
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CREATE TABLE t3 (b int) ;
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INSERT INTO t3 VALUES (0),(0);
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CREATE TABLE t4 (a int, b int, c int, d int, PRIMARY KEY (a)) ;
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INSERT INTO t4 VALUES (28,0,0,0),(29,3,0,0);
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CREATE TABLE t5 (a int, b int, c int, d int, KEY (c,b)) ;
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INSERT INTO t5 VALUES (28,0,0,0),(29,3,0,0);
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SET @@optimizer_switch='semijoin=ON,loosescan=ON,firstmatch=OFF,materialization=OFF';
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EXPLAIN SELECT *
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FROM t3
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WHERE t3.b > ALL (
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SELECT c
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FROM t4
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WHERE t4.a >= t3.b
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AND a = SOME (SELECT b FROM t5));
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
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2 DEPENDENT SUBQUERY t5 index c c 10 NULL 2 Using where; Using index; Start temporary
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2 DEPENDENT SUBQUERY t4 eq_ref PRIMARY PRIMARY 4 test.t5.b 1 Using where; End temporary
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SELECT *
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FROM t3
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WHERE t3.b > ALL (
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SELECT c
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FROM t4
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WHERE t4.a >= t3.b
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AND a = SOME (SELECT b FROM t5));
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b
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0
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0
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set @@optimizer_switch='default';
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drop table t3, t4, t5;
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#
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# LP BUG#858038 The result of a query with NOT IN subquery depends on the state of the optimizer switch
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#
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set @optimizer_switch_save= @@optimizer_switch;
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create table t1 (c1 char(2) not null, c2 char(2));
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create table t2 (c3 char(2), c4 char(2));
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insert into t1 values ('a1', 'b1');
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insert into t1 values ('a2', 'b2');
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insert into t2 values ('x1', 'y1');
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insert into t2 values ('a2', null);
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set @@optimizer_switch='in_to_exists=off,materialization=on,partial_match_rowid_merge=off,partial_match_table_scan=on';
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explain select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);
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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 MATERIALIZED t2 ALL NULL NULL NULL NULL 2
|
|
select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);
|
|
c1 c2
|
|
set @@optimizer_switch='in_to_exists=off,materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off';
|
|
explain select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);
|
|
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 MATERIALIZED t2 ALL NULL NULL NULL NULL 2
|
|
select * from t1 where c1 = 'a2' and (c1, c2) not in (select * from t2);
|
|
c1 c2
|
|
drop table t1, t2;
|
|
set optimizer_switch= @optimizer_switch_save;
|
|
#
|
|
# MDEV-12673: cost-based choice between materialization and in-to-exists
|
|
#
|
|
CREATE TABLE t1 (
|
|
pk1 int, a1 varchar(3), b1 varchar(3), PRIMARY KEY (pk1), KEY(a1), KEY(b1)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (1,'foo','bar'),(2,'bar','foo');
|
|
CREATE TABLE t2 (pk2 INT PRIMARY KEY, a2 VARCHAR(3), KEY(a2)) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (1,'abc'),(2,'xyz'),(3,'foo');
|
|
SELECT 'qux' IN ( SELECT a1 FROM t1 INNER JOIN t2 WHERE a2 = b1 AND pk2 = 3 ) as exp;
|
|
exp
|
|
0
|
|
SELECT 'bar' IN ( SELECT a1 FROM t1 INNER JOIN t2 WHERE a2 = b1 AND pk2 = 3 ) as exp;
|
|
exp
|
|
1
|
|
EXPLAIN
|
|
SELECT 'bar' IN ( SELECT a1 FROM t1 INNER JOIN t2 WHERE a2 = b1 AND pk2 = 3 ) as exp;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
|
|
2 SUBQUERY t2 const PRIMARY,a2 PRIMARY 4 const 1
|
|
2 SUBQUERY t1 ref a1,b1 b1 6 const 1 Using where
|
|
DROP TABLE t1,t2;
|
|
CREATE TABLE t1 (i1 INT) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (1);
|
|
CREATE TABLE t2 (i2 int, c2 varchar(3), KEY(i2,c2)) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (1,'abc'),(2,'foo');
|
|
CREATE TABLE t3 (pk3 int PRIMARY KEY, c3 varchar(3)) ENGINE=MyISAM;
|
|
INSERT INTO t3 VALUES (1,'foo'),(2,'bar');
|
|
SELECT * FROM t1 WHERE i1 NOT IN (
|
|
SELECT i2 FROM t2 RIGHT JOIN t3 ON (c3 = c2) WHERE pk3 = i1
|
|
);
|
|
i1
|
|
1
|
|
EXPLAIN
|
|
SELECT * FROM t1 WHERE i1 NOT IN (
|
|
SELECT i2 FROM t2 RIGHT JOIN t3 ON (c3 = c2) WHERE pk3 = i1
|
|
);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 system NULL NULL NULL NULL 1
|
|
2 DEPENDENT SUBQUERY t3 const PRIMARY PRIMARY 4 const 1
|
|
2 DEPENDENT SUBQUERY t2 index i2 i2 11 NULL 2 Using where; Using index
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# MDEV-7599: in-to-exists chosen after min/max optimization
|
|
#
|
|
set @optimizer_switch_save= @@optimizer_switch;
|
|
CREATE TABLE t1 (a INT, KEY(a)) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (1),(2);
|
|
CREATE TABLE t2 (b INT, c INT) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (1,6),(2,4), (8,9);
|
|
SELECT * FROM t2 WHERE b != ALL (SELECT MIN(a) FROM t1, t2 WHERE t2.c = t2.b);
|
|
b c
|
|
EXPLAIN EXTENDED SELECT * FROM t2 WHERE b != ALL (SELECT MIN(a) FROM t1, t2 WHERE t2.c = t2.b);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
2 MATERIALIZED t1 index NULL a 5 NULL 2 100.00 Using index
|
|
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` where !<expr_cache><`test`.`t2`.`b`>(<in_optimizer>(`test`.`t2`.`b`,`test`.`t2`.`b` in ( <materialize> (/* select#2 */ select min(`test`.`t1`.`a`) from `test`.`t1` join `test`.`t2` where `test`.`t2`.`c` = `test`.`t2`.`b` ), <primary_index_lookup>(`test`.`t2`.`b` in <temporary table> on distinct_key where `test`.`t2`.`b` = `<subquery2>`.`MIN(a)`))))
|
|
set optimizer_switch= 'materialization=off';
|
|
SELECT * FROM t2 WHERE b != ALL (SELECT MIN(a) FROM t1, t2 WHERE t2.c = t2.b);
|
|
b c
|
|
EXPLAIN EXTENDED SELECT * FROM t2 WHERE b != ALL (SELECT MIN(a) FROM t1, t2 WHERE t2.c = t2.b);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 3 100.00 Using where
|
|
2 DEPENDENT SUBQUERY t1 index NULL a 5 NULL 2 100.00 Using index
|
|
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select `test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` where !<expr_cache><`test`.`t2`.`b`>(<in_optimizer>(`test`.`t2`.`b`,<exists>(/* select#2 */ select min(`test`.`t1`.`a`) from `test`.`t1` join `test`.`t2` where `test`.`t2`.`c` = `test`.`t2`.`b` having trigcond(<cache>(`test`.`t2`.`b`) = <ref_null_helper>(min(`test`.`t1`.`a`))))))
|
|
set optimizer_switch= @optimizer_switch_save;
|
|
DROP TABLE t1,t2;
|
|
CREATE TABLE t1 (f1 varchar(10)) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES ('foo'),('bar');
|
|
CREATE TABLE t2 (f2 varchar(10), key(f2)) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES ('baz'),('qux');
|
|
CREATE TABLE t3 (f3 varchar(10)) ENGINE=MyISAM;
|
|
INSERT INTO t3 VALUES ('abc'),('def');
|
|
SELECT * FROM t1
|
|
WHERE f1 = ALL( SELECT MAX(t2a.f2)
|
|
FROM t2 AS t2a INNER JOIN t2 t2b INNER JOIN t3
|
|
ON (f3 = t2b.f2) );
|
|
f1
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# MDEV-12963: min/max optimization optimizing away all tables employed
|
|
# for uncorrelated IN subquery used in a disjunct of WHERE
|
|
#
|
|
create table t1 (a int, index idx(a)) engine=myisam;
|
|
insert into t1 values (4),(7),(1),(3),(9);
|
|
select * from t1 where a in (select max(a) from t1 where a < 4) or a > 5;
|
|
a
|
|
3
|
|
7
|
|
9
|
|
explain
|
|
select * from t1 where a in (select max(a) from t1 where a < 4) or a > 5;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 index idx idx 5 NULL 5 Using where; Using index
|
|
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
|
drop table t1;
|
|
#
|
|
# MDEV-13135: subquery with ON expression subject to
|
|
# semi-join optimizations
|
|
#
|
|
CREATE TABLE t1 (a INT);
|
|
CREATE ALGORITHM=MERGE VIEW v1 AS SELECT a AS v_a FROM t1;
|
|
INSERT INTO t1 VALUES (1),(3);
|
|
CREATE TABLE t2 (b INT, KEY(b));
|
|
INSERT INTO t2 VALUES (3),(4);
|
|
SELECT * FROM t1 WHERE a NOT IN (
|
|
SELECT b FROM t2 INNER JOIN v1 ON (b IN ( SELECT a FROM t1 ))
|
|
WHERE v_a = b
|
|
);
|
|
a
|
|
1
|
|
DROP VIEW v1;
|
|
DROP TABLE t1,t2;
|