derived_split_innodb.result

SET @save_innodb_stats_persistent=@@GLOBAL.innodb_stats_persistent;
SET GLOBAL innodb_stats_persistent=0;
#
# 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
#
# MDEV-26301: Split optimization refills temporary table too many times
#
create table t1(a int, b int);
insert into t1 select seq,seq from seq_1_to_5;
create table t2(a int, b int, key(a));
insert into t2
select A.seq,B.seq from seq_1_to_25 A, seq_1_to_2 B;
create table t3(a int, b int, key(a));
insert into t3
select A.seq,B.seq from seq_1_to_5 A, seq_1_to_3 B;
analyze table t1,t2,t3 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
test.t2	analyze	status	Engine-independent statistics collected
test.t2	analyze	status	Table is already up to date
test.t3	analyze	status	Engine-independent statistics collected
test.t3	analyze	status	Table is already up to date
explain
select * from
(t1 left join t2 on t2.a=t1.b) left join t3 on t3.a=t1.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
1	SIMPLE	t2	ref	a	a	5	test.t1.b	2	Using where
1	SIMPLE	t3	ref	a	a	5	test.t1.b	3	Using where
create table t10 (
grp_id int,
col1 int,
key(grp_id)
);
insert into t10
select
A.seq,
B.seq
from
seq_1_to_100 A,
seq_1_to_100 B;
create table t11 (
col1 int,
col2 int
);
insert into t11
select A.seq, A.seq from seq_1_to_10 A;
analyze table t10,t11 persistent for all;
Table	Op	Msg_type	Msg_text
test.t10	analyze	status	Engine-independent statistics collected
test.t10	analyze	status	Table is already up to date
test.t11	analyze	status	Engine-independent statistics collected
test.t11	analyze	status	OK
explain select * from
(
(t1 left join t2 on t2.a=t1.b)
left join t3 on t3.a=t1.b
) left join (select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id) T on T.grp_id=t1.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
1	PRIMARY	t2	ref	a	a	5	test.t1.b	2	Using where
1	PRIMARY	t3	ref	a	a	5	test.t1.b	3	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	10	Using where
2	LATERAL DERIVED	t10	ref	grp_id	grp_id	5	test.t1.b	100	
2	LATERAL DERIVED	t11	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
# The important part in the below output is:
#        "lateral": 1,
#        "query_block": {
#          "select_id": 2,
#          "r_loops": 5,  <-- must be 5, not 30.
analyze format=json select * from
(
(t1 left join t2 on t2.a=t1.b)
left join t3 on t3.a=t1.b
) left join (select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id) T on T.grp_id=t1.b;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "const_condition": "1",
    "nested_loop": [
      {
        "table": {
          "table_name": "t1",
          "access_type": "ALL",
          "r_loops": 1,
          "rows": 5,
          "r_rows": 5,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100
        }
      },
      {
        "table": {
          "table_name": "t2",
          "access_type": "ref",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "5",
          "used_key_parts": ["a"],
          "ref": ["test.t1.b"],
          "r_loops": 5,
          "rows": 2,
          "r_rows": 2,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "attached_condition": "trigcond(trigcond(t1.b is not null))"
        }
      },
      {
        "table": {
          "table_name": "t3",
          "access_type": "ref",
          "possible_keys": ["a"],
          "key": "a",
          "key_length": "5",
          "used_key_parts": ["a"],
          "ref": ["test.t1.b"],
          "r_loops": 10,
          "rows": 3,
          "r_rows": 3,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "attached_condition": "trigcond(trigcond(t1.b is not null))"
        }
      },
      {
        "table": {
          "table_name": "<derived2>",
          "access_type": "ref",
          "possible_keys": ["key0"],
          "key": "key0",
          "key_length": "5",
          "used_key_parts": ["grp_id"],
          "ref": ["test.t1.b"],
          "r_loops": 30,
          "rows": 10,
          "r_rows": 1,
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_filtered": 100,
          "attached_condition": "trigcond(trigcond(t1.b is not null))",
          "materialized": {
            "lateral": 1,
            "query_block": {
              "select_id": 2,
              "r_loops": 5,
              "r_total_time_ms": "REPLACED",
              "outer_ref_condition": "t1.b is not null",
              "nested_loop": [
                {
                  "table": {
                    "table_name": "t10",
                    "access_type": "ref",
                    "possible_keys": ["grp_id"],
                    "key": "grp_id",
                    "key_length": "5",
                    "used_key_parts": ["grp_id"],
                    "ref": ["test.t1.b"],
                    "r_loops": 5,
                    "rows": 100,
                    "r_rows": 100,
                    "r_table_time_ms": "REPLACED",
                    "r_other_time_ms": "REPLACED",
                    "filtered": 100,
                    "r_filtered": 100
                  }
                },
                {
                  "block-nl-join": {
                    "table": {
                      "table_name": "t11",
                      "access_type": "ALL",
                      "r_loops": 5,
                      "rows": 10,
                      "r_rows": 10,
                      "r_table_time_ms": "REPLACED",
                      "r_other_time_ms": "REPLACED",
                      "filtered": 100,
                      "r_filtered": 100
                    },
                    "buffer_type": "flat",
                    "buffer_size": "1Kb",
                    "join_type": "BNL",
                    "attached_condition": "trigcond(t11.col1 = t10.col1)",
                    "r_loops": 500,
                    "r_filtered": 10,
                    "r_unpack_time_ms": "REPLACED",
                    "r_other_time_ms": "REPLACED",
                    "r_effective_rows": 10
                  }
                }
              ]
            }
          }
        }
      }
    ]
  }
}
create table t21 (pk int primary key);
insert into t21 values (1),(2),(3);
create table t22 (pk int primary key);
insert into t22 values (1),(2),(3);
explain
select * from
t21, t22,
(
(t1 left join t2 on t2.a=t1.b)
left join t3 on t3.a=t1.b
) left join (select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id) T on T.grp_id=t1.b
where
t21.pk=1 and t22.pk=2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t21	const	PRIMARY	PRIMARY	4	const	1	Using index
1	PRIMARY	t22	const	PRIMARY	PRIMARY	4	const	1	Using index
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
1	PRIMARY	t2	ref	a	a	5	test.t1.b	2	Using where
1	PRIMARY	t3	ref	a	a	5	test.t1.b	3	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	10	Using where
2	LATERAL DERIVED	t10	ref	grp_id	grp_id	5	test.t1.b	100	
2	LATERAL DERIVED	t11	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
explain
select * from
t21,
(
(t1 left join t2 on t2.a=t1.b)
left join t3 on t3.a=t1.b
) left join (select grp_id, count(*)
from
t22 join t10 left join t11 on t11.col1=t10.col1
where
t22.pk=1
group by grp_id) T on T.grp_id=t1.b
where
t21.pk=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t21	const	PRIMARY	PRIMARY	4	const	1	Using index
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
1	PRIMARY	t2	ref	a	a	5	test.t1.b	2	Using where
1	PRIMARY	t3	ref	a	a	5	test.t1.b	3	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	10	Using where
2	LATERAL DERIVED	t22	const	PRIMARY	PRIMARY	4	const	1	Using index
2	LATERAL DERIVED	t10	ref	grp_id	grp_id	5	test.t1.b	100	
2	LATERAL DERIVED	t11	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
create table t5 (
pk int primary key
);
insert into t5 select seq from seq_1_to_1000;
explain
select * from
t21,
(
(((t1 join t5 on t5.pk=t1.b)) left join t2 on t2.a=t1.b)
left join t3 on t3.a=t1.b
) left join (select grp_id, count(*)
from
t22 join t10 left join t11 on t11.col1=t10.col1
where
t22.pk=1
group by grp_id) T on T.grp_id=t1.b
where
t21.pk=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t21	const	PRIMARY	PRIMARY	4	const	1	Using index
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	Using where
1	PRIMARY	t5	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	1	Using index
1	PRIMARY	t2	ref	a	a	5	test.t1.b	2	
1	PRIMARY	t3	ref	a	a	5	test.t1.b	3	
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	10	Using where
2	LATERAL DERIVED	t22	const	PRIMARY	PRIMARY	4	const	1	Using index
2	LATERAL DERIVED	t10	ref	grp_id	grp_id	5	test.t5.pk	100	Using index condition
2	LATERAL DERIVED	t11	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
drop table t1,t2,t3,t5, t10, t11, t21, t22;
create table t1(a int, b int);
insert into t1 select seq,seq from seq_1_to_5;
create table t2(a int, b int, key(a));
insert into t2
select A.seq,B.seq from seq_1_to_25 A, seq_1_to_2 B;
create table t3(a int, b int, key(a));
insert into t3
select A.seq,B.seq from seq_1_to_5 A, seq_1_to_3 B;
analyze table t1,t2,t3 persistent for all;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
test.t2	analyze	status	Engine-independent statistics collected
test.t2	analyze	status	Table is already up to date
test.t3	analyze	status	Engine-independent statistics collected
test.t3	analyze	status	Table is already up to date
create table t10 (
grp_id int,
col1 int,
key(grp_id)
);
insert into t10
select
A.seq,
B.seq
from
seq_1_to_100 A,
seq_1_to_100 B;
create table t11 (
col1 int,
col2 int
);
insert into t11
select A.seq, A.seq from seq_1_to_10 A;
analyze table t10,t11 persistent for all;
Table	Op	Msg_type	Msg_text
test.t10	analyze	status	Engine-independent statistics collected
test.t10	analyze	status	Table is already up to date
test.t11	analyze	status	Engine-independent statistics collected
test.t11	analyze	status	OK
explain select *
from
(
(t1 left join t2 on t2.a=t1.b)
left join
t3
on t3.a=t1.b
) 
left join
( 
select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id
)dt
on dt.grp_id=t1.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
1	PRIMARY	t2	ref	a	a	5	test.t1.b	2	Using where
1	PRIMARY	t3	ref	a	a	5	test.t1.b	3	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	10	Using where
2	LATERAL DERIVED	t10	ref	grp_id	grp_id	5	test.t1.b	100	
2	LATERAL DERIVED	t11	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
select *
from
(
(t1 left join t2 on t2.a=t1.b)
left join
t3
on t3.a=t1.b
) 
left join
( 
select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id
)dt
on dt.grp_id=t1.b;
a	b	a	b	a	b	grp_id	count(*)
1	1	1	1	1	1	1	100
1	1	1	1	1	2	1	100
1	1	1	1	1	3	1	100
1	1	1	2	1	1	1	100
1	1	1	2	1	2	1	100
1	1	1	2	1	3	1	100
2	2	2	1	2	1	2	100
2	2	2	1	2	2	2	100
2	2	2	1	2	3	2	100
2	2	2	2	2	1	2	100
2	2	2	2	2	2	2	100
2	2	2	2	2	3	2	100
3	3	3	1	3	1	3	100
3	3	3	1	3	2	3	100
3	3	3	1	3	3	3	100
3	3	3	2	3	1	3	100
3	3	3	2	3	2	3	100
3	3	3	2	3	3	3	100
4	4	4	1	4	1	4	100
4	4	4	1	4	2	4	100
4	4	4	1	4	3	4	100
4	4	4	2	4	1	4	100
4	4	4	2	4	2	4	100
4	4	4	2	4	3	4	100
5	5	5	1	5	1	5	100
5	5	5	1	5	2	5	100
5	5	5	1	5	3	5	100
5	5	5	2	5	1	5	100
5	5	5	2	5	2	5	100
5	5	5	2	5	3	5	100
set join_cache_level=4;
explain select *
from
(
(t1 left join t2 on t2.a=t1.b)
left join
t3
on t3.a=t1.b
) 
left join
( 
select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id
)dt
on dt.grp_id=t1.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
1	PRIMARY	t2	ref	a	a	5	test.t1.b	2	Using where
1	PRIMARY	t3	ref	a	a	5	test.t1.b	3	Using where
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	10	Using where
2	LATERAL DERIVED	t10	ref	grp_id	grp_id	5	test.t1.b	100	
2	LATERAL DERIVED	t11	hash_ALL	NULL	#hash#$hj	5	test.t10.col1	10	Using where; Using join buffer (flat, BNLH join)
select *
from
(
(t1 left join t2 on t2.a=t1.b)
left join
t3
on t3.a=t1.b
) 
left join
( 
select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id
)dt
on dt.grp_id=t1.b;
a	b	a	b	a	b	grp_id	count(*)
1	1	1	1	1	1	1	100
1	1	1	1	1	2	1	100
1	1	1	1	1	3	1	100
1	1	1	2	1	1	1	100
1	1	1	2	1	2	1	100
1	1	1	2	1	3	1	100
2	2	2	1	2	1	2	100
2	2	2	1	2	2	2	100
2	2	2	1	2	3	2	100
2	2	2	2	2	1	2	100
2	2	2	2	2	2	2	100
2	2	2	2	2	3	2	100
3	3	3	1	3	1	3	100
3	3	3	1	3	2	3	100
3	3	3	1	3	3	3	100
3	3	3	2	3	1	3	100
3	3	3	2	3	2	3	100
3	3	3	2	3	3	3	100
4	4	4	1	4	1	4	100
4	4	4	1	4	2	4	100
4	4	4	1	4	3	4	100
4	4	4	2	4	1	4	100
4	4	4	2	4	2	4	100
4	4	4	2	4	3	4	100
5	5	5	1	5	1	5	100
5	5	5	1	5	2	5	100
5	5	5	1	5	3	5	100
5	5	5	2	5	1	5	100
5	5	5	2	5	2	5	100
5	5	5	2	5	3	5	100
set join_cache_level=default;
drop index a on t2;
drop index a on t3;
explain select *
from
(
(t1 left join t2 on t2.a=t1.b)
left join
t3
on t3.a=t1.b
) 
left join
( 
select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id
)dt
on dt.grp_id=t1.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	50	Using where; Using join buffer (flat, BNL join)
1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	15	Using where; Using join buffer (incremental, BNL join)
1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.b	1000	Using where
2	DERIVED	t10	ALL	grp_id	NULL	NULL	NULL	10000	Using temporary; Using filesort
2	DERIVED	t11	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
select *
from
(
(t1 left join t2 on t2.a=t1.b)
left join
t3
on t3.a=t1.b
) 
left join
( 
select grp_id, count(*)
from t10 left join t11 on t11.col1=t10.col1
group by grp_id
)dt
on dt.grp_id=t1.b;
a	b	a	b	a	b	grp_id	count(*)
1	1	1	1	1	1	1	100
1	1	1	2	1	1	1	100
1	1	1	1	1	2	1	100
1	1	1	2	1	2	1	100
1	1	1	1	1	3	1	100
1	1	1	2	1	3	1	100
2	2	2	1	2	1	2	100
2	2	2	2	2	1	2	100
2	2	2	1	2	2	2	100
2	2	2	2	2	2	2	100
2	2	2	1	2	3	2	100
2	2	2	2	2	3	2	100
3	3	3	1	3	1	3	100
3	3	3	2	3	1	3	100
3	3	3	1	3	2	3	100
3	3	3	2	3	2	3	100
3	3	3	1	3	3	3	100
3	3	3	2	3	3	3	100
4	4	4	1	4	1	4	100
4	4	4	2	4	1	4	100
4	4	4	1	4	2	4	100
4	4	4	2	4	2	4	100
4	4	4	1	4	3	4	100
4	4	4	2	4	3	4	100
5	5	5	1	5	1	5	100
5	5	5	2	5	1	5	100
5	5	5	1	5	2	5	100
5	5	5	2	5	2	5	100
5	5	5	1	5	3	5	100
5	5	5	2	5	3	5	100
drop table t1,t2,t3;
drop table t10, t11;
# End of 10.4 tests
SET GLOBAL innodb_stats_persistent=@save_innodb_stats_persistent;