diff options
Diffstat (limited to 'mysql-test/main/opt_tvc.result')
| -rw-r--r-- | mysql-test/main/opt_tvc.result | 53 |
1 files changed, 49 insertions, 4 deletions
diff --git a/mysql-test/main/opt_tvc.result b/mysql-test/main/opt_tvc.result index 5329a9f64be..a68e70e8a25 100644 --- a/mysql-test/main/opt_tvc.result +++ b/mysql-test/main/opt_tvc.result @@ -629,11 +629,9 @@ SELECT * FROM t1 WHERE i IN (NULL, NULL, NULL, NULL, NULL); i EXPLAIN EXTENDED SELECT * FROM t1 WHERE i IN (NULL, NULL, NULL, NULL, NULL); id select_type table type possible_keys key key_len ref rows filtered Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 -1 PRIMARY <derived3> ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(t1); Using join buffer (flat, BNL join) -3 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: -Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` semi join ((values (NULL),(NULL),(NULL),(NULL),(NULL)) `tvc_0`) where `test`.`t1`.`i` = `tvc_0`.`_col_1` +Note 1003 select `test`.`t1`.`i` AS `i` from `test`.`t1` where `test`.`t1`.`i` in (NULL,NULL,NULL,NULL,NULL) SET in_predicate_conversion_threshold= default; DROP TABLE t1; # @@ -687,3 +685,50 @@ f1 f2 1 1 DROP TABLE t1,t2,t3; SET @@in_predicate_conversion_threshold= default; +# +# MDEV-20900: IN predicate to IN subquery conversion causes performance regression +# +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; +explain select * from t1 where t1.a IN ("1","2","3","4"); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 10 Using where +select * from t1 where t1.a IN ("1","2","3","4"); +a b +1 1 +2 2 +3 3 +4 4 +set in_predicate_conversion_threshold=0; +explain select * from t1 where t1.a IN ("1","2","3","4"); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 10 Using where +select * from t1 where t1.a IN ("1","2","3","4"); +a b +1 1 +2 2 +3 3 +4 4 +set in_predicate_conversion_threshold=2; +explain select * from t1 where (t1.a,t1.b) in (("1","1"),(2,2),(3,3),(4,4)); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 10 Using where +select * from t1 where (t1.a,t1.b) in (("1","1"),(2,2),(3,3),(4,4)); +a b +1 1 +2 2 +3 3 +4 4 +set in_predicate_conversion_threshold=0; +explain select * from t1 where (t1.a,t1.b) in (("1","1"),(2,2),(3,3),(4,4)); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 10 Using where +select * from t1 where (t1.a,t1.b) in (("1","1"),(2,2),(3,3),(4,4)); +a b +1 1 +2 2 +3 3 +4 4 +drop table t1; +SET @@in_predicate_conversion_threshold= default; |