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Diffstat (limited to 'mysql-test/main/selectivity.test')
| -rw-r--r-- | mysql-test/main/selectivity.test | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mysql-test/main/selectivity.test b/mysql-test/main/selectivity.test index eb3f6e2893a..d911957ddc7 100644 --- a/mysql-test/main/selectivity.test +++ b/mysql-test/main/selectivity.test @@ -1,4 +1,5 @@ --source include/have_stat_tables.inc +--source include/have_sequence.inc --disable_warnings drop table if exists t0,t1,t2,t3; @@ -1104,3 +1105,26 @@ set @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectiv drop table t1; drop function f1; +--echo # +--echo # MDEV-19834 Selectivity of an equality condition discounted twice +--echo # +set @@optimizer_use_condition_selectivity=4; +set @@use_stat_tables='preferably'; +create table t1 (a int, b int, key (b), key (a)); +insert into t1 +select (rand(1)*1000)/10, (rand(1001)*1000)/50 from seq_1_to_1000; +analyze table t1 ; + +--echo # Check what info the optimizer has about selectivities +explain extended select * from t1 use index () where a in (17,51,5); +explain extended select * from t1 use index () where b=2; + +--echo # Now, the equality is used for ref access, while the range condition +--echo # gives selectivity data +explain extended select * from t1 where a in (17,51,5) and b=2; +drop table t1; + +set use_stat_tables= @save_use_stat_tables; +set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; +--echo # End of 10.1 tests + |