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author | Igor Babaev <igor@askmonty.org> | 2015-02-05 20:09:08 -0800 |
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committer | Igor Babaev <igor@askmonty.org> | 2015-02-05 20:09:08 -0800 |
commit | 587c72088c661e6ca441460675e1f1dc69d5e749 (patch) | |
tree | 74519f5e6c0da2e7c067c21cb53238e878ac13ef /mysql-test/t/selectivity.test | |
parent | 826d7c68d210f5c34998108aa5e29909344e3683 (diff) | |
download | mariadb-git-587c72088c661e6ca441460675e1f1dc69d5e749.tar.gz |
Fixed bug mdev-7316.
The function table_cond_selectivity() should take into account that condition selectivity
for some fields can be set to 0.
Diffstat (limited to 'mysql-test/t/selectivity.test')
-rw-r--r-- | mysql-test/t/selectivity.test | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mysql-test/t/selectivity.test b/mysql-test/t/selectivity.test index 77ee5f49bef..c46ff69295f 100644 --- a/mysql-test/t/selectivity.test +++ b/mysql-test/t/selectivity.test @@ -942,5 +942,34 @@ set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivit drop table t0,t1,t2; +--echo # +--echo # Bug mdev-7316: a conjunct in WHERE with selectivity == 0 +--echo # + +CREATE TABLE t1 (a varchar(16), b int, PRIMARY KEY(a), KEY(b)) ENGINE=INNODB; +INSERT INTO t1 VALUES + ('USAChinese',10), ('USAEnglish',20), ('USAFrench',30); + +CREATE TABLE t2 (i int) ENGINE=INNODB; +INSERT INTO t2 VALUES + (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(1),(2),(3),(4); + +ANALYZE TABLE t1, t2; + +set use_stat_tables='preferably'; +set optimizer_use_condition_selectivity=3; + +EXPLAIN EXTENDED +SELECT * FROM t1, t2 + WHERE a <> 'USARussian' AND b IS NULL; + +SELECT * FROM t1, t2 + WHERE a <> 'USARussian' AND b IS NULL; + +set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; + +DROP TABLE t1,t2; + + set use_stat_tables=@save_use_stat_tables; |