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Diffstat (limited to 'mysql-test/main/opt_tvc.test')
| -rw-r--r-- | mysql-test/main/opt_tvc.test | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/mysql-test/main/opt_tvc.test b/mysql-test/main/opt_tvc.test index 7319dbdc9e8..e4e8c6d7919 100644 --- a/mysql-test/main/opt_tvc.test +++ b/mysql-test/main/opt_tvc.test @@ -3,6 +3,7 @@ # source include/have_debug.inc; source include/default_optimizer_switch.inc; +source include/have_sequence.inc; create table t1 (a int, b int); @@ -397,3 +398,33 @@ SELECT * FROM t3 WHERE (f1,f2) IN ((2, 2), (1, 2), (3, 5), (1, 1)); DROP TABLE t1,t2,t3; SET @@in_predicate_conversion_threshold= default; + +--echo # +--echo # MDEV-20900: IN predicate to IN subquery conversion causes performance regression +--echo # + +create table t1(a int, b int); +insert into t1 select seq-1, seq-1 from seq_1_to_10; + +set in_predicate_conversion_threshold=2; + +let $query= select * from t1 where t1.a IN ("1","2","3","4"); +eval explain $query; +eval $query; + +set in_predicate_conversion_threshold=0; +eval explain $query; +eval $query; + +set in_predicate_conversion_threshold=2; +let $query= select * from t1 where (t1.a,t1.b) in (("1","1"),(2,2),(3,3),(4,4)); +eval explain $query; +eval $query; + +set in_predicate_conversion_threshold=0; +eval explain $query; +eval $query; + +drop table t1; +SET @@in_predicate_conversion_threshold= default; + |