diff options
Diffstat (limited to 'mysql-test/main/table_elim.result')
| -rw-r--r-- | mysql-test/main/table_elim.result | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/mysql-test/main/table_elim.result b/mysql-test/main/table_elim.result index 4f648f45895..ac07a8d2878 100644 --- a/mysql-test/main/table_elim.result +++ b/mysql-test/main/table_elim.result @@ -985,3 +985,30 @@ drop table t1, t11, t12, t13, t2; # # End of MDEV-26278: Table elimination does not work across derived tables # +# +# MDEV-28817 Derived table elimination does not work for +# multiple occurencies of a field +# +create table t1 (a int, b int); +insert into t1 select seq, seq+10 from seq_1_to_10; +create table t2 (a int, b int, c int); +insert into t2 select A.seq, B.seq, 123 from seq_1_to_3 A, seq_1_to_3 B; +explain select t1.* from t1 left join +(select a as a1, max(c), b as b1, b as b2, a as a2 +from t2 group by a, b) D +on D.a1=t1.a and D.b2=t1.b; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 10 +explain select t1.* from t1 left join +(select a as a1, b as b1, b as b2, a as a2, count(*) +from t2 group by a, b) D +on D.a2=t1.a and D.b1=t1.b; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 10 +explain select t1.* from t1 left join +(select a as a1, b as b1, b as b2, min(a+b) as minab, a as a2 +from t2 group by a1, b2) D +on D.a2=t1.a and D.b1=t1.b; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 10 +drop table t1, t2; |