mariadb/mysql-test/r/subselect_sj_nonmerged.result

drop table if exists t0, t1, t2, t3, t4;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='semijoin=on,materialization=on';
set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 as select * from t0;
# The following should use full scan on <subquery2> and it must scan 1 row:
explain select * from t0 where a in (select max(a) from t1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	1	
1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	
select * from t0 where a in (select max(a) from t1);
a
9
insert into t1 values (11);
select * from t0 where a in (select max(a) from t1);
a
delete from t1 where a=11;
insert into t0 values (NULL);
select * from t0 where a in (select max(a) from t1);
a
9
delete from t0 where a is NULL;
delete from t1;
select * from t0 where a in (select max(a) from t1);
a
insert into t0 values (NULL);
select * from t0 where a in (select max(a) from t1);
a
delete from t0 where a is NULL;
drop table t1;
create table t1 (a int, b int);
insert into t1 select a,a from t0;
create table t2 as select * from t1 where a<5;
create table t3 as select (A.a + 10*B.a) as a from t0 A, t0 B;
alter table t3 add primary key(a);
# The following should have do a full scan on <subquery2> and scan 5 rows 
#   (despite that subquery's join output estimate is 50 rows)
explain select * from t3 where a in (select max(t2.a) from t1, t2 group by t2.b);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	5	Using where
1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	8	<subquery2>.max(t2.a)	1	Using where; Using index
2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
# Compare to this which really will have 50 record combinations:
explain select * from t3 where a in (select max(t2.a) from t1, t2 group by t2.b, t1.b);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	50	Using where
1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	8	<subquery2>.max(t2.a)	1	Using where; Using index
2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
# Outer joins also work:
explain select * from t3 
where a in (select max(t2.a) from t1 left join t2 on t1.a=t2.a group by t2.b, t1.b);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	50	Using where
1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	8	<subquery2>.max(t2.a)	1	Using where; Using index
2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using temporary
2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using where
create table t4 (a int, b int, filler char(20), unique key(a,b));
insert into t4 select A.a + 10*B.a, A.a + 10*B.a, 'filler' from t0 A, t0 B;
explain select * from t0, t4 where 
t4.b=t0.a and t4.a in (select max(t2.a) from t1, t2 group by t2.b);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	10	
1	PRIMARY	t4	ALL	a	NULL	NULL	NULL	100	Using where; Using join buffer (flat, BNL join)
1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	5	test.t4.a	1	
2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
insert into t4 select 100 + (B.a *100 + A.a), 100 + (B.a*100 + A.a), 'filler' from t4 A, t0 B;
explain select * from t4 where 
t4.a in (select max(t2.a) from t1, t2 group by t2.b) and 
t4.b in (select max(t2.a) from t1, t2 group by t2.b);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	5	Using where
1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
1	PRIMARY	t4	ref	a	a	10	<subquery2>.max(t2.a),<subquery3>.max(t2.a)	12	
3	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
3	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
drop table t1,t2,t3,t4;
drop table t0;
#
# BUG#780359: Crash with get_fanout_with_deps in maria-5.3-mwl90
#
CREATE TABLE t1 (f1 int);
INSERT INTO t1 VALUES (2),(2);
CREATE TABLE t2 (f3 int);
INSERT INTO t2 VALUES (2),(2);
SELECT *
FROM t1
WHERE ( f1 ) IN (
SELECT t2.f3
FROM t2
WHERE t2.f3 = 97
AND t2.f3 = 50
GROUP BY 1
);
f1
DROP TABLE t1, t2;
#
# BUG#727183: WL#90 does not trigger with non-comma joins
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a int, key(a));
insert into t1 select A.a + 10*B.a + 100*C.a from t0 A, t0 B, t0 C;
# The following must use non-merged SJ-Materialization:
explain select * from t1 X join t0 Y on X.a < Y.a where X.a in (select max(a) from t0);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	1	Using where
1	PRIMARY	X	ref	a	a	5	<subquery2>.max(a)	1	Using index
1	PRIMARY	Y	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	
drop table t0, t1;
set optimizer_switch=@save_optimizer_switch;