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Added the test case for bug mdev-5200.

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The bug was fixed by the patch applied to the 5.3 tree in the revision 3727.
This commit is contained in:
Igor Babaev
2013-11-26 15:04:21 -08:00
parent 6774e86d83
commit acc539a2c4
3 changed files with 88 additions and 0 deletions
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29
mysql-test/r/selectivity_innodb.result
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@@ -1136,6 +1136,35 @@ Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a`
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
drop table t1;
set use_stat_tables=@save_use_stat_tables;
#
# Bug mdev-5200: impossible where with a semijoin subquery
# when optimizer_use_condition_selectivity=2
#
set use_stat_tables = 'preferably';
set optimizer_use_condition_selectivity = 2;
CREATE TABLE t1 (i1 int) ENGINE=MyISAM;
INSERT INTO t1 VALUES (0), (1);
CREATE TABLE t2 (pk2 int, i2 int, c2 char(1), PRIMARY KEY(pk2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1,8,'m'), (2,9,'b');
CREATE TABLE t3 (c3 char(1), INDEX(c3)) ENGINE=MyISAM;
INSERT INTO t3 VALUES ('v'), ('c');
ANALYZE TABLE t1,t2,t3;
Table Op Msg_type Msg_text
test.t1 analyze status OK
test.t2 analyze status OK
test.t3 analyze status OK
SELECT * FROM t1
WHERE 2 IN ( SELECT pk2 FROM t2 LEFT JOIN t3 ON (c3 = c2 ) WHERE i2 = 3 );
i1
EXPLAIN EXTENDED
SELECT * FROM t1
WHERE 2 IN ( SELECT pk2 FROM t2 LEFT JOIN t3 ON (c3 = c2 ) WHERE i2 = 3 );
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 select `test`.`t1`.`i1` AS `i1` from `test`.`t1` semi join (`test`.`t2` left join `test`.`t3` on((`test`.`t3`.`c3` = 'b'))) where 0
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
DROP TABLE t1,t2,t3;
set use_stat_tables=@save_use_stat_tables;
set optimizer_switch=@save_optimizer_switch_for_selectivity_test;
SET SESSION STORAGE_ENGINE=DEFAULT;