path: root/mysql-test/main/explain.result

drop table if exists t1;
create table t1 (id int not null, str char(10), unique(str));
explain select * from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	Const row not found
insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
select * from t1 where str is null;
id	str
1	NULL
2	NULL
select * from t1 where str="foo";
id	str
3	foo
explain select * from t1 where str is null;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	str	str	11	const	2	Using index condition
explain select * from t1 where str="foo";
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	str	str	11	const	1	
explain select * from t1 ignore key (str) where str="foo";
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
explain select * from t1 use key (str,str) where str="foo";
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	str	str	11	const	1	
explain select * from t1 use key (str,str,foo) where str="foo";
ERROR 42000: Key 'foo' doesn't exist in table 't1'
explain select * from t1 ignore key (str,str,foo) where str="foo";
ERROR 42000: Key 'foo' doesn't exist in table 't1'
drop table t1;
explain select 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
create table t1 (a int not null);
explain select count(*) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
insert into t1 values(1);
explain select count(*) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
insert into t1 values(1);
explain select count(*) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
drop table t1;
set names koi8r;
create table ��� (���0 int, ���1 int, key ���0 (���0), key ���01 (���0,���1));
insert into ��� (���0) values (1);
insert into ��� (���0) values (2);
explain select ���0 from ��� where ���0=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	���	ref	���0,���01	���0	5	const	1	Using index
drop table ���;
set names latin1;
select 3 into @v1;
explain select 3 into @v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
create table t1(f1 int, f2 int);
insert into t1 values (1,1);
create view v1 as select * from t1 where f1=1;
explain extended select * from v1 where f2=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
Warnings:
Note	1003	select 1 AS `f1`,1 AS `f2` from dual where 1
explain extended select * from t1 where 0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
Warnings:
Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where 0
explain extended select * from t1 where 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
Warnings:
Note	1003	select 1 AS `f1`,1 AS `f2` from dual where 1
explain extended select * from t1 having 0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
Warnings:
Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` having 0
explain extended select * from t1 having 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
Warnings:
Note	1003	select 1 AS `f1`,1 AS `f2` from dual having 1
drop view v1;
drop table t1;
CREATE TABLE t1(c INT);
INSERT INTO t1 VALUES (),();
CREATE TABLE t2 (b INT,
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b),
KEY(b),KEY(b),KEY(b),KEY(b),KEY(b));
Warnings:
Note	1831	Duplicate index `b_2`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_3`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_4`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_5`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_6`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_7`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_8`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_9`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_10`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_11`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_12`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_13`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_14`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_15`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_16`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_17`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_18`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_19`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_20`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_21`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_22`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_23`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_24`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_25`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_26`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_27`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_28`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_29`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_30`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_31`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_32`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_33`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_34`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_35`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_36`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_37`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_38`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_39`. This is deprecated and will be disallowed in a future release
Note	1831	Duplicate index `b_40`. This is deprecated and will be disallowed in a future release
INSERT INTO t2 VALUES (),(),();
EXPLAIN SELECT 1 FROM
(SELECT 1 FROM t2,t1 WHERE b < c GROUP BY 1 LIMIT 1) AS d2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
X	X	X	X	X	X	X	X	X	
X	X	X	X	X	X	X	X	X	
X	X	X	X	X	X	X	X	X	Range checked for each record (index map: 0xFFFFFFFFFF)
DROP TABLE t2;
DROP TABLE t1;
CREATE TABLE t1(a INT);
CREATE TABLE t2(a INT);
INSERT INTO t1 VALUES (1),(2);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN EXTENDED SELECT 1
FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
EXPLAIN EXTENDED SELECT 1
FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
prepare s1 from 
'EXPLAIN EXTENDED SELECT 1  
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
execute s1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
prepare s1 from 
'EXPLAIN EXTENDED SELECT 1  
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
execute s1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
execute s1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
DROP TABLE t1,t2;
CREATE TABLE t1 (a INT PRIMARY KEY);
EXPLAIN EXTENDED SELECT COUNT(a) FROM t1 USE KEY(a);
ERROR 42000: Key 'a' doesn't exist in table 't1'
DROP TABLE t1;
CREATE TABLE t1(a LONGTEXT);
INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet));
INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet));
EXPLAIN SELECT DISTINCT 1 FROM t1,
(SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) as d1
WHERE t1.a = d1.a;
ERROR 42S22: Unknown column 'd1.a' in 'where clause'
DROP TABLE t1;
#
# Bug#48295:
# explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode
#
CREATE TABLE t1 (f1 INT not null);
SELECT @@session.sql_mode INTO @old_sql_mode;
SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
EXPLAIN EXTENDED SELECT 1 FROM t1
WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t );
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
2	SUBQUERY	t1	system	NULL	NULL	NULL	NULL	0	0.00	Const row not found
2	SUBQUERY	t	system	NULL	NULL	NULL	NULL	0	0.00	Const row not found
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from `test`.`t1` where 0
SET SESSION sql_mode=@old_sql_mode;
DROP TABLE t1;
End of 5.0 tests.
#
# Bug#37870: Usage of uninitialized value caused failed assertion.
#
create table t1 (dt datetime not null, t time not null);
create table t2 (dt datetime not null);
insert into t1 values ('2001-01-01 1:1:1', '1:1:1'),
('2001-01-01 1:1:1', '1:1:1');
insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1');
SET @save_join_cache_level=@@join_cache_level;
SET join_cache_level=0;
flush tables;
EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	OUTR	ALL	NULL	NULL	NULL	NULL	2	Using where
1	PRIMARY	INNR	ALL	NULL	NULL	NULL	NULL	2	Using where; FirstMatch(OUTR)
flush tables;
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL );
dt
flush tables;
EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	OUTR	ALL	NULL	NULL	NULL	NULL	2	Using where
1	PRIMARY	INNR	ALL	NULL	NULL	NULL	NULL	2	Using where; FirstMatch(OUTR)
flush tables;
SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' );
dt
2001-01-01 01:01:01
2001-01-01 01:01:01
SET join_cache_level=@save_join_cache_level;
drop tables t1, t2;
#
# Bug#47669: Query showed by EXPLAIN EXTENDED gives different result from original query
#
CREATE TABLE t1 (c int);
INSERT INTO t1 VALUES (NULL);
CREATE TABLE t2 (d int);
INSERT INTO t2 VALUES (NULL), (0);
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	100.00	
2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
Warnings:
Note	1276	Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note	1003	/* select#1 */ select (/* select#2 */ select 1 from `test`.`t2` where `test`.`t2`.`d` = NULL) AS `(SELECT 1 FROM t2 WHERE d = c)` from dual
DROP TABLE t1, t2;
#
# Bug#30302: Tables that were optimized away are printed in the
#            EXPLAIN EXTENDED warning.
#
create table t1(f1 int);
create table t2(f2 int);
insert into t1 values(1);
insert into t2 values(1),(2);
explain extended select * from t1 where f1=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
Warnings:
Note	1003	select 1 AS `f1` from dual where 1
explain extended select * from t1 join t2 on f1=f2 where f1=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
Warnings:
Note	1003	select 1 AS `f1`,`test`.`t2`.`f2` AS `f2` from `test`.`t2` where `test`.`t2`.`f2` = 1
drop table t1,t2;
#
# Bug #48419: another explain crash..
#
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (b BLOB, KEY b(b(100)));
INSERT INTO t2 VALUES ('1'), ('2'), ('3');
FLUSH TABLES;
EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND t.a);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
DROP TABLE t1, t2;
#
# Bug #48573: difference of index selection between rpm binary and
#             .tar.gz, windows vs linux..
#
CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5));
INSERT INTO t1 VALUES(4, 1, 1, 1);
INSERT INTO t1 VALUES(3, 1, 1, 1);
INSERT INTO t1 VALUES(2, 1, 1, 1);
INSERT INTO t1 VALUES(1, 1, 1, 1);
INSERT INTO t1 VALUES(5, 2, 1, 1);
INSERT INTO t1 VALUES(6, 2, 1, 1);
INSERT INTO t1 VALUES(7, 3, 1, 1);
INSERT INTO t1 VALUES(9, 3, 1, 1);
INSERT INTO t1 VALUES(10, 4, 1, 1);
INSERT INTO t1 VALUES(11, 4, 1, 1);
EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	c2,c2_2	c2	10	const,const	4	Using where
DROP TABLE t1;
#
# Bug#56814 Explain + subselect + fulltext crashes server
#
CREATE TABLE t1(f1 VARCHAR(6) NOT NULL,
FULLTEXT KEY(f1),UNIQUE(f1));
INSERT INTO t1 VALUES ('test');
EXPLAIN SELECT 1 FROM t1
WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a ON (MATCH(t1.f1) AGAINST (""))
WHERE t1.f1 GROUP BY t1.f1));
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
PREPARE stmt FROM
'EXPLAIN SELECT 1 FROM t1
 WHERE 1 > ALL((SELECT t1.f1 FROM t1 RIGHT OUTER JOIN t1 a
 ON (MATCH(t1.f1) AGAINST (""))
 WHERE t1.f1 GROUP BY t1.f1))';
EXECUTE stmt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
EXECUTE stmt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM
'EXPLAIN SELECT 1 FROM t1
 WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a
 ON (MATCH(t1.f1) AGAINST (""))
 WHERE t1.f1 GROUP BY t1.f1))';
EXECUTE stmt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
EXECUTE stmt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	
2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
DEALLOCATE PREPARE stmt;
DROP TABLE t1;
End of 5.1 tests.
#
# Bug#11829785 EXPLAIN EXTENDED CRASH WITH RIGHT OUTER JOIN, SUBQUERIES
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0), (0);
PREPARE s FROM 
'EXPLAIN EXTENDED
SELECT SUBSTRING(1, (SELECT 1 FROM t1 a1 RIGHT OUTER JOIN t1 ON 0)) AS d
FROM t1 WHERE 0 > ANY (SELECT @a FROM t1)';
EXECUTE s;
ERROR 21000: Subquery returns more than 1 row
DEALLOCATE PREPARE s;
DROP TABLE t1;
#
# Bug#776295: EXPLAIN EXTENDED with always false multiple equality
#             in the WHERE condition of a derived table
#
CREATE TABLE t1 (a int) ;
CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (8);
set @tmp_optimizer_switch=@@optimizer_switch;
set optimizer_switch='derived_merge=off,derived_with_keys=off';
EXPLAIN EXTENDED
SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	0.00	Const row not found
2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
Warnings:
Note	1003	/* select#1 */ select NULL AS `a` from (/* select#2 */ select NULL AS `a` from `test`.`t1` where 0) `t`
set optimizer_switch=@tmp_optimizer_switch;
DROP TABLE t1,t2;
#
# MDEV-7215: EXPLAIN REPLACE produces an error:
# Column count doesn't match value count 
#
create table t1 (a int);
insert into t1 values (1);
create table t2 (b int, c int);
replace into t2 select 100, (select a from t1);
explain replace into t2 select 100, (select a from t1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
2	SUBQUERY	t1	system	NULL	NULL	NULL	NULL	1	
drop table t1, t2;
# End of 10.1 tests
#
# End of 10.2 test
#
#
# MDEV-25564: Server crashed on running some EXPLAIN statements
#
EXPLAIN (SELECT 1,3) UNION (SELECT 2,1) ORDER BY (SELECT 2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
2	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union1,2>	ALL	NULL	NULL	NULL	NULL	NULL	Using filesort
3	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
#
# MDEV-23160: SIGSEGV in Explain_node::print_explain_for_children on UNION SELECT
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3);
EXPLAIN
SELECT *
FROM t1
WHERE
a IN (SELECT a FROM t1
UNION
SELECT a FROM t1 ORDER BY (SELECT a))
UNION
SELECT * FROM t1 ORDER BY (SELECT a);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
3	DEPENDENT UNION	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
5	UNION	t1	ALL	NULL	NULL	NULL	NULL	3	
NULL	UNION RESULT	<union1,5>	ALL	NULL	NULL	NULL	NULL	NULL	Using filesort
6	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
drop table t1;
explain
VALUES ( (VALUES (2))) UNION VALUES ( (SELECT 3));
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
5	SUBQUERY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union1,3>	ALL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1249	Select 4 was reduced during optimization
#
# End of 10.4 tests
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (3),(4);
EXPLAIN SELECT * FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
EXPLAIN DELETE t2 FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
prepare stmt from "EXPLAIN DELETE t2 FROM t1, t2 WHERE t2.b IN (SELECT 5 UNION SELECT 6)";
execute stmt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
execute stmt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
DROP TABLE t1, t2;
#
# End of 10.5 tests
#