mariadb/mysql-test/main/derived_split_innodb.result

#
# MDEV-16917: do not use splitting for derived with join cache
#
CREATE TABLE t1 (
n1 int(10) NOT NULL,
n2 int(10) NOT NULL,
c1 char(1) NOT NULL,
KEY c1 (c1),
KEY n1_c1_n2 (n1,c1,n2)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (0, 2, 'a'), (1, 3, 'a');
insert into t1 select seq+1,seq+2,'c' from seq_1_to_1000;
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
EXPLAIN SELECT t1.n1 FROM t1, (SELECT n1, n2 FROM t1 WHERE c1 = 'a' GROUP BY n1) as t
WHERE t.n1 = t1.n1 AND t.n2 = t1.n2 AND c1 = 'a' GROUP BY n1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ref	c1,n1_c1_n2	c1	1	const	2	Using index condition; Using where; Using temporary; Using filesort
1	PRIMARY	<derived2>	ref	key0	key0	8	test.t1.n1,test.t1.n2	2	
2	LATERAL DERIVED	t1	ref	c1,n1_c1_n2	n1_c1_n2	4	test.t1.n1	1	Using where; Using index
SELECT t1.n1 FROM t1, (SELECT n1, n2 FROM t1 WHERE c1 = 'a' GROUP BY n1) as t
WHERE t.n1 = t1.n1 AND t.n2 = t1.n2 AND c1 = 'a' GROUP BY n1;
n1
0
1
DROP TABLE t1;
#
# MDEV-17211: splittable materialized derived joining 3 tables with
#             GROUP BY list containing fields from 2 of them
#
CREATE TABLE t1 (
id1 int, i1 int, id2 int,
PRIMARY KEY (id1), KEY (i1), KEY (id2)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,1,1);
CREATE TABLE t2 (id2 int, i2 int) ENGINE=InnoDB;
INSERT INTO t2  VALUES (1, 1);
CREATE TABLE t3 (id3 int, i3 int, PRIMARY KEY (id3)) ENGINE=InnoDB;
INSERT INTO t3 VALUES (1,1);
EXPLAIN SELECT id3
FROM (SELECT t3.id3, t2.i2, t1.id2  FROM t3,t1,t2
WHERE t3.i3=t1.id1 AND t2.id2=t1.id2
GROUP BY t3.id3, t1.id2) AS t,
t2
WHERE t2.id2=t.id2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t2.id2	2	
2	DERIVED	t3	ALL	NULL	NULL	NULL	NULL	1	Using where; Using temporary; Using filesort
2	DERIVED	t1	eq_ref	PRIMARY,id2	PRIMARY	4	test.t3.i3	1	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
SELECT id3
FROM (SELECT t3.id3, t2.i2, t1.id2  FROM t3,t1,t2
WHERE t3.i3=t1.id1 AND t2.id2=t1.id2
GROUP BY t3.id3, t1.id2) AS t,
t2
WHERE t2.id2=t.id2;
id3
1
DROP TABLE t1,t2,t3;
#
# Bug mdev-17381: equi-join of derived table with join_cache_level=4
#
CREATE TABLE t1 (
id int NOT NULL,
amount decimal DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=INNODB;
CREATE TABLE t2 (
id int NOT NULL,
name varchar(50) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=INNODB;
INSERT INTO t1 VALUES
(1, 10.0000), (2, 20.0000), (3, 30.0000), (4, 40.0000),
(5, NULL), (6, NULL), (7, 70.0000), (8, 80.0000);
INSERT INTO t2 VALUES
(1,'A'), (2,'B'), (3,'C'), (4,'D'), (5, NULL), (6, NULL),
(7,'E'), (8,'F'), (9,'G'), (10,'H'), (11, NULL), (12, NULL);
set join_cache_level=4;
SELECT t2.id,t2.name,t.total_amt
FROM  t2
LEFT JOIN
(SELECT id, sum(amount) total_amt FROM t1 GROUP BY id) AS t
ON t2.id=t.id
WHERE t2.id < 3;
id	name	total_amt
1	A	10
2	B	20
EXPLAIN SELECT t2.id,t2.name,t.total_amt
FROM  t2
LEFT JOIN
(SELECT id, sum(amount) total_amt FROM t1 GROUP BY id) AS t
ON t2.id=t.id
WHERE t2.id < 3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t2.id	2	
2	LATERAL DERIVED	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.id	1	
set join_cache_level=default;
DROP TABLE t1,t2;
#
# Bug mdev-18467: join of grouping view and a base table as inner operand
#                 of left join with on condition containing impossible range
#
create table t1 (f1 int, f2 int, key(f2)) engine=InnoDB;
insert into t1 values (3,33), (7,77), (1,11);
create table t2 (f1 int, f2 int, primary key (f1)) engine=InnoDB;
insert into t2 values (3,33), (9,99), (1,11);
create view v1 as
select f1, max(f2) as f2 from t2 group by f1;
select t.f2
from t1
left join
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
on t1.f1=t.f1;
f2
NULL
NULL
NULL
explain select t.f2
from t1
left join
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
on t1.f1=t.f1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t	const	f2	NULL	NULL	NULL	1	Impossible ON condition
1	PRIMARY	<derived2>	const	key1	NULL	NULL	NULL	1	Impossible ON condition
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
2	DERIVED	t2	ALL	PRIMARY	NULL	NULL	NULL	3	Using temporary; Using filesort
set statement optimizer_switch='split_materialized=off' for explain select t.f2
from t1
left join
(v1 join t1 as t on v1.f1=t.f1 and t.f2 = null)
on t1.f1=t.f1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t	const	f2	NULL	NULL	NULL	1	Impossible ON condition
1	PRIMARY	<derived3>	const	key1	NULL	NULL	NULL	1	Impossible ON condition
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
3	DERIVED	t2	index	NULL	PRIMARY	4	NULL	3	
drop view v1;
drop table t1,t2;
#
#  MDEV-23723: Crash when test_if_skip_sort_order() is checked for derived table subject to split
#
CREATE TABLE t1 (a INT, b INT, KEY (a), KEY (a,b)) ENGINE=InnoDB;
CREATE TABLE t2 (c INT, KEY (c)) ENGINE=InnoDB;
SELECT * FROM t1 t1a JOIN t1 t1b;
a	b	a	b
INSERT INTO t2 VALUES (1),(2);
INSERT INTO t1 VALUES (1,2),(3,4),(5,6),(7,8),(9,10),(11,12);
set statement optimizer_switch='split_materialized=off' for EXPLAIN
SELECT *
FROM
t1 JOIN
(SELECT t1.a, t1.b FROM t1, t2 WHERE t1.b = t2.c GROUP BY t1.a, t1.b) as dt
WHERE
t1.a = dt.a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	a,a_2	a_2	10	NULL	6	Using where; Using index
1	PRIMARY	<derived3>	ref	key0	key0	5	test.t1.a	2	
3	DERIVED	t1	index	NULL	a_2	10	NULL	6	Using where; Using index
3	DERIVED	t2	ref	c	c	5	test.t1.b	1	Using index
set statement optimizer_switch='split_materialized=on' for  EXPLAIN
SELECT *
FROM
t1 JOIN
(SELECT t1.a, t1.b FROM t1, t2 WHERE t1.b = t2.c GROUP BY t1.a, t1.b) as dt
WHERE
t1.a = dt.a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	index	a,a_2	a_2	10	NULL	6	Using where; Using index
1	PRIMARY	<derived3>	ref	key0	key0	5	test.t1.a	2	
3	LATERAL DERIVED	t1	ref	a,a_2	a	5	test.t1.a	1	Using where; Using temporary; Using filesort
3	LATERAL DERIVED	t2	ref	c	c	5	test.t1.b	1	Using index
DROP TABLE t1, t2;
#
# Bug mdev-25714: usage non-splitting covering index is cheaper than
#                 usage of the best splitting index for one group
#
create table t1 (
id int not null, itemid int not null, index idx (itemid)
) engine=innodb;
insert into t1 values (1, 2), (2,2), (4,2), (4,2), (0,3), (3,3);
create table t2 (id int not null) engine=innodb;
insert into t2 values (2);
create table t3 (
id int not null, itemid int not null, userid int not null, primary key (id),
index idx1 (userid, itemid), index idx2 (itemid)
) engine innodb;
insert into t3 values (1,1,1), (2,1,1), (3,2,1), (4,2,1), (5,3,1);
set use_stat_tables='never';
set optimizer_use_condition_selectivity=1;
analyze table t1,t2,t3;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
test.t2	analyze	status	OK
test.t3	analyze	status	OK
set optimizer_switch='split_materialized=on';
explain select t1.id, t1.itemid, dt.id, t2.id
from t1,
(select itemid, max(id) as id from t3 where userid = 1 group by itemid) dt,
t2
where t1.id = dt.id and t1.itemid = dt.itemid and t2.id=t1.itemid;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	
1	PRIMARY	<derived2>	ref	key1	key1	4	test.t2.id	2	
1	PRIMARY	t1	ALL	idx	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
2	DERIVED	t3	ref	idx1,idx2	idx1	4	const	5	Using where; Using index
select t1.id, t1.itemid, dt.id, t2.id
from t1,
(select itemid, max(id) as id from t3 where userid = 1 group by itemid) dt,
t2
where t1.id = dt.id and t1.itemid = dt.itemid and t2.id=t1.itemid;
id	itemid	id	id
4	2	4	2
4	2	4	2
set optimizer_switch='split_materialized=off';
explain select t1.id, t1.itemid, dt.id, t2.id
from t1,
(select itemid, max(id) as id from t3 where userid = 1 group by itemid) dt,
t2
where t1.id = dt.id and t1.itemid = dt.itemid and t2.id=t1.itemid;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	1	
1	PRIMARY	<derived2>	ref	key1	key1	4	test.t2.id	2	
1	PRIMARY	t1	ALL	idx	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
2	DERIVED	t3	ref	idx1	idx1	4	const	5	Using where; Using index
select t1.id, t1.itemid, dt.id, t2.id
from t1,
(select itemid, max(id) as id from t3 where userid = 1 group by itemid) dt,
t2
where t1.id = dt.id and t1.itemid = dt.itemid and t2.id=t1.itemid;
id	itemid	id	id
4	2	4	2
4	2	4	2
drop table t1,t2,t3;
set optimizer_switch='split_materialized=default';
set use_stat_tables=default;
set optimizer_use_condition_selectivity=default;
#
# MDEV-26337: subquery with groupby and ROLLUP returns incorrect results 
#  (The testcase is taken from testcase for MDEV-13389 due to it being
#   much smaller)
#
create table t3 (a int, b int, c char(127), index idx_b(b)) engine=myisam;
insert into t3 values
(8,11,'aa'), (5,15,'cc'), (1,14,'bb'), (2,12,'aa'), (7,17,'cc'),
(7,18,'aa'), (2,11,'aa'), (7,10,'bb'), (3,11,'dd'), (4,12,'ee'),
(5,14,'dd'), (9,12,'ee');
create table t4 (a int, b int, c char(127), index idx(a,c)) engine=myisam;
insert into t4 values
(7,10,'cc'), (1,20,'aa'), (2,23,'bb'), (7,18,'cc'), (1,30,'bb'),
(4,71,'xx'), (3,15,'aa'), (7,82,'aa'), (8,12,'dd'), (4,15,'aa'),
(11,33,'yy'), (10,42,'zz'), (4,53,'xx'), (10,17,'yy'), (7,12,'cc'),
(8,20,'dd'), (7,32,'bb'), (1,50,'aa'), (3,40,'bb'), (3,77,'aa');
insert into t4 select a+10, b+10, concat(c,'f') from t4;
analyze table t3,t4;
Table	Op	Msg_type	Msg_text
test.t3	analyze	status	Engine-independent statistics collected
test.t3	analyze	status	OK
test.t4	analyze	status	Engine-independent statistics collected
test.t4	analyze	status	OK
# This should use a plan with LATERAL DERIVED:
explain select t3.a,t3.c,t.max,t.min
from t3 join
(select a, c, max(b) max, min(b) min from t4 group by a,c) t
on t3.a=t.a and t3.c=t.c
where t3.b > 15;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t3	range	idx_b	idx_b	5	NULL	2	Using index condition; Using where
1	PRIMARY	<derived2>	ref	key0	key0	133	test.t3.a,test.t3.c	2	
2	LATERAL DERIVED	t4	ref	idx	idx	133	test.t3.a,test.t3.c	1	
# ... and if one adds WITH ROLLUP, then LATERAL DERIVED is no longer used:
explain select t3.a,t3.c,t.max,t.min
from t3 join
(select a, c, max(b) max, min(b) min from t4 group by a,c with rollup) t
on t3.a=t.a and t3.c=t.c
where t3.b > 15;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t3	range	idx_b	idx_b	5	NULL	2	Using index condition; Using where
1	PRIMARY	<derived2>	ref	key0	key0	133	test.t3.a,test.t3.c	4	
2	DERIVED	t4	ALL	NULL	NULL	NULL	NULL	40	Using filesort
drop table t3, t4;
# End of 10.3 tests