diff options
Diffstat (limited to 'mysql-test/r/subselect_sj_mat.result')
| -rw-r--r-- | mysql-test/r/subselect_sj_mat.result | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/mysql-test/r/subselect_sj_mat.result b/mysql-test/r/subselect_sj_mat.result index c6a0344c8a3..55b54ea4eb2 100644 --- a/mysql-test/r/subselect_sj_mat.result +++ b/mysql-test/r/subselect_sj_mat.result @@ -2186,3 +2186,54 @@ drop database mysqltest2; drop database mysqltest3; drop database mysqltest4; # End of 5.5 tests +# +# MDEV-7220: Materialization strategy is not used for REPLACE ... SELECT +# +create table t0(a int); +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1 (a int, b int, c int); +insert into t1 +select A.a+B.a*10+C.a*100, A.a+B.a*10+C.a*100, A.a+B.a*10+C.a*100 +from t0 A, t0 B, t0 C; +create table t2 (a int, b int, c int); +insert into t2 select A.a, A.a, A.a from t1 A; +insert into t2 select * from t2; +insert into t2 select * from t2; +create table t3 as select * from t2 limit 1; +# The testcase only makes sense if the following uses Materialization: +explain +select * from t1 where (a,b) in (select max(a),b from t2 group by b); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 1000 Using where +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 8 test.t1.a,test.t1.b 1 +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4000 Using temporary +flush status; +replace into t3 +select * from t1 where (a,b) in (select max(a),b from t2 group by b); +# Sequential reads: +# 1K is read from t1 +# 4K is read from t2 +# 1K groups is read from the tmp. table +# +# Lookups: +# 4K lookups in group by table +# 1K lookups in temp.table +# +# Writes: +# 2x 1K writes to temporary tables (grouping table and subquery materialization table +# +# The point is that neither counter should be in the millions (this +# will happen if Materialization is not used +show status where Variable_name like 'Handler_read%' or Variable_name like 'Handler_%write%'; +Variable_name Value +Handler_read_first 0 +Handler_read_key 5000 +Handler_read_last 0 +Handler_read_next 0 +Handler_read_prev 0 +Handler_read_rnd 0 +Handler_read_rnd_deleted 0 +Handler_read_rnd_next 6003 +Handler_tmp_write 2000 +Handler_write 1000 +drop table t0,t1,t2,t3; |