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| author | unknown <timour@askmonty.org> | 2012-06-05 17:25:10 +0300 |
|---|---|---|
| committer | unknown <timour@askmonty.org> | 2012-06-05 17:25:10 +0300 |
| commit | f1ab00891ad050711557c6cdc62b17fff896aed9 (patch) | |
| tree | 31e8c967b17eece8c13679d9828ce7a822c7c616 /mysql-test/r/subselect_no_scache.result | |
| parent | 265d5aaa2e240288fff98e7c129cf441728152f8 (diff) | |
| download | mariadb-git-f1ab00891ad050711557c6cdc62b17fff896aed9.tar.gz | |
Fixed bug lp:1000649
Analysis:
When the method JOIN::choose_subquery_plan() decided to apply
the IN-TO-EXISTS strategy, it set the unit and select_lex
uncacheable flag to UNCACHEABLE_DEPENDENT_INJECTED unconditionally.
As result, even if IN-TO-EXISTS injected non-correlated predicates,
the subquery was still treated as correlated.
Solution:
Set the subquery as correlated only if the injected predicate(s) depend
on the outer query.
Diffstat (limited to 'mysql-test/r/subselect_no_scache.result')
| -rw-r--r-- | mysql-test/r/subselect_no_scache.result | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mysql-test/r/subselect_no_scache.result b/mysql-test/r/subselect_no_scache.result index 6bbd8085731..253be05cc5b 100644 --- a/mysql-test/r/subselect_no_scache.result +++ b/mysql-test/r/subselect_no_scache.result @@ -1326,7 +1326,7 @@ SELECT 0 IN (SELECT 1 FROM t1 a); EXPLAIN EXTENDED SELECT 0 IN (SELECT 1 FROM t1 a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used -2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1003 select <in_optimizer>(0,<exists>(select 1 from `test`.`t1` `a` where (0 = 1))) AS `0 IN (SELECT 1 FROM t1 a)` INSERT INTO t1 (pseudo) VALUES ('test1'); @@ -1336,7 +1336,7 @@ SELECT 0 IN (SELECT 1 FROM t1 a); EXPLAIN EXTENDED SELECT 0 IN (SELECT 1 FROM t1 a); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used -2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1003 select <in_optimizer>(0,<exists>(select 1 from `test`.`t1` `a` where (0 = 1))) AS `0 IN (SELECT 1 FROM t1 a)` drop table t1; @@ -5323,7 +5323,7 @@ WHERE ('0') IN ( SELECT a FROM t1 GROUP BY a ) GROUP BY b; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort -2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where +2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where SELECT b FROM t1 WHERE ('0') IN ( SELECT a FROM t1 GROUP BY a ) GROUP BY b; |