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mariadb/mysql-test/r/subselect4.result
unknown 4a9c027ad8 Fix LP BUG#778413 
Analysis:
The subquery is evaluated first during ref-optimization of the outer
query because the subquery is considered constant from the perspective
of the outer query. Thus an attempt is made to evaluate the MAX subquery
and use the new constant to drive an index nested loops join.
During this evaluation the inner-most subquery replaces the JOIN_TAB
with a new one that fetches the data from a temp table.
The function select_describe crashes at the lines:
        TABLE_LIST *real_table= table->pos_in_table_list; 
	item_list.push_back(new Item_string(real_table->alias,
					    strlen(real_table->alias),
					    cs));
because 'table' is a temp table, and it has no corresponding table
reference. This 'real_table' is NULL, and real_table->alias results
in a crash.

Solution:
In the spirit of MWL#89 prevent the evaluation of expensive predicates
during optimization. This patch prevents the evaluation of expensive
predicates during ref optimization.


sql/item_subselect.h:
  Remove unused class member. Not needed for the fix, but noticed now and removed.
2011-05-17 00:00:11 +03:00

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#
# Bug #46791: Assertion failed:(table->key_read==0),function unknown
# function,file sql_base.cc
#
CREATE TABLE t1 (a INT, b INT, KEY(a));
INSERT INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,1),(2,2);
CREATE TABLE t3 LIKE t1;
# should have 1 impossible where and 2 dependent subqueries
EXPLAIN
SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 2 Using where; Using index; Using temporary
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 0 const row not found
# should not crash the next statement
SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
1
1
# should not crash: the crash is caused by the previous statement
SELECT 1;
1
1
DROP TABLE t1,t2,t3;
#
# Bug #47106: Crash / segfault on adding EXPLAIN to a non-crashing
# query
#
CREATE TABLE t1 (
a INT,
b INT,
PRIMARY KEY (a),
KEY b (b)
);
INSERT INTO t1 VALUES (1, 1), (2, 1);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 SELECT * FROM t1;
CREATE TABLE t3 LIKE t1;
INSERT INTO t3 SELECT * FROM t1;
# Should not crash.
# Should have 1 impossible where and 2 dependent subqs.
EXPLAIN
SELECT
(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
FROM t3 WHERE 1 = 0 GROUP BY 1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 DEPENDENT SUBQUERY t1 index NULL PRIMARY 4 NULL 2 Using index
2 DEPENDENT SUBQUERY t2 ALL b NULL NULL NULL 2 Range checked for each record (index map: 0x2)
# should return 0 rows
SELECT
(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
FROM t3 WHERE 1 = 0 GROUP BY 1;
(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
DROP TABLE t1,t2,t3;
End of 5.0 tests.
CREATE TABLE t1 (col_int_nokey int(11) NOT NULL, col_varchar_nokey varchar(1) NOT NULL) engine=myisam;
INSERT INTO t1 VALUES (2,'s'),(0,'v'),(2,'s');
CREATE TABLE t2 (
pk int(11) NOT NULL AUTO_INCREMENT,
`col_int_key` int(11) NOT NULL,
col_varchar_key varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY `col_int_key` (`col_int_key`),
KEY `col_varchar_key` (`col_varchar_key`)
) ENGINE=MyISAM;
INSERT INTO t2 VALUES (4,10,'g'), (5,20,'v');
SELECT t1.col_int_nokey,(SELECT MIN( t2_a.col_int_key ) FROM t2 t2_a, t2 t2_b, t1 t1_a WHERE t1_a.col_varchar_nokey = t2_b.col_varchar_key and t1.col_int_nokey ) as sub FROM t1;
col_int_nokey sub
2 10
0 NULL
2 10
SELECT t1.col_int_nokey,(SELECT MIN( t2_a.col_int_key ) +1 FROM t2 t2_a, t2 t2_b, t1 t1_a WHERE t1_a.col_varchar_nokey = t2_b.col_varchar_key and t1.col_int_nokey ) as sub FROM t1;
col_int_nokey sub
2 11
0 NULL
2 11
DROP TABLE t1,t2;
#
# Bug#54568: create view cause Assertion failed: 0,
# file .\item_subselect.cc, line 836
#
EXPLAIN SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
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
Warnings:
Note 1249 Select 2 was reduced during optimization
DESCRIBE SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
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
Warnings:
Note 1249 Select 2 was reduced during optimization
# None of the below should crash
CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );
DROP VIEW v1, v2;
#
# Bug#51070: Query with a NOT IN subquery predicate returns a wrong
# result set
#
CREATE TABLE t1 ( a INT, b INT );
INSERT INTO t1 VALUES ( 1, NULL ), ( 2, NULL );
CREATE TABLE t2 ( c INT, d INT );
INSERT INTO t2 VALUES ( NULL, 3 ), ( NULL, 4 );
CREATE TABLE t3 ( e INT, f INT );
INSERT INTO t3 VALUES ( NULL, NULL ), ( NULL, NULL );
CREATE TABLE t4 ( a INT );
INSERT INTO t4 VALUES (1), (2), (3);
CREATE TABLE t5 ( a INT );
INSERT INTO t5 VALUES (NULL), (2);
EXPLAIN
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 );
a b
EXPLAIN
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 ) IS NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 ) IS NULL;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE ( a, b ) IN ( SELECT c, d FROM t2 ) IS NULL;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 ) IS UNKNOWN;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE (( a, b ) NOT IN ( SELECT c, d FROM t2 )) IS UNKNOWN;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE 1 = 1 AND ( a, b ) NOT IN ( SELECT c, d FROM t2 );
a b
EXPLAIN
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT e, f FROM t3 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT e, f FROM t3 );
a b
EXPLAIN
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT a, b FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT a, b FROM t1 );
c d
EXPLAIN
SELECT * FROM t3 WHERE ( e, f ) NOT IN ( SELECT c, d FROM t2 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t3 WHERE ( e, f ) NOT IN ( SELECT c, d FROM t2 );
e f
EXPLAIN
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT e, f FROM t3 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT e, f FROM t3 );
c d
SELECT * FROM t1 WHERE ( a, b ) NOT IN
( SELECT c, d FROM t2 WHERE c = 1 AND c <> 1 );
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE b NOT IN ( SELECT c FROM t2 WHERE c = 1 );
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE NULL NOT IN ( SELECT c FROM t2 WHERE c = 1 AND c <> 1 );
a b
1 NULL
2 NULL
DROP TABLE t1, t2, t3, t4, t5;
#
# Bug#58207: invalid memory reads when using default column value and
# tmptable needed
#
CREATE TABLE t(a VARCHAR(245) DEFAULT
'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa');
INSERT INTO t VALUES (''),(''),(''),(''),(''),(''),(''),(''),(''),(''),('');
SELECT * FROM (SELECT default(a) FROM t GROUP BY a) d;
default(a)
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
DROP TABLE t;
#
# End of 5.1 tests.
#
#
# BUG#46743 "Azalea processing correlated, aggregate SELECT
# subqueries incorrectly"
#
CREATE TABLE t1 (c int);
INSERT INTO t1 VALUES (NULL);
CREATE TABLE t2 (d int , KEY (d));
INSERT INTO t2 VALUES (NULL),(NULL);
0 rows in subquery
SELECT 1 AS RESULT FROM t2,t1 WHERE d = c;
RESULT
base query
SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 ;
RESULT
NULL
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT 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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where 0)) AS `RESULT` from `test`.`t1`
first equivalent variant
SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c ;
RESULT
NULL
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = IFNULL(c,NULL)) AS RESULT FROM t1 GROUP BY c;
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where 0)) AS `RESULT` from `test`.`t1` group by NULL
second equivalent variant
SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ;
RESULT
NULL
EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) AS RESULT FROM t1 GROUP BY c ;
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1
Note 1003 select <expr_cache><NULL>((select 1 from `test`.`t2` where 0)) AS `RESULT` from `test`.`t1` group by NULL
DROP TABLE t1,t2;
#
# BUG#45928 "Differing query results depending on MRR and
# engine_condition_pushdown settings"
#
CREATE TABLE `t1` (
`pk` int(11) NOT NULL AUTO_INCREMENT,
`time_nokey` time NOT NULL,
`varchar_key` varchar(1) NOT NULL,
`varchar_nokey` varchar(1) NOT NULL,
PRIMARY KEY (`pk`),
KEY `varchar_key` (`varchar_key`)
) AUTO_INCREMENT=12 DEFAULT CHARSET=latin1;
INSERT INTO `t1` VALUES (10,'00:00:00','i','i'),(11,'00:00:00','','');
set @old_optimizer_switch = @@session.optimizer_switch,
@old_optimizer_use_mrr = @@session.optimizer_use_mrr,
@old_engine_condition_pushdown = @@session.engine_condition_pushdown;
SET SESSION OPTIMIZER_SWITCH = 'materialization=off,semijoin=off,loosescan=off,firstmatch=off';
SET SESSION optimizer_use_mrr = 'force';
SET SESSION engine_condition_pushdown = 1;
SELECT `time_nokey` G1 FROM t1 WHERE ( `varchar_nokey` , `varchar_key` ) IN (
SELECT `varchar_nokey` , `varchar_nokey` ) AND `varchar_key` >= 'c' HAVING G1 ORDER
BY `pk` ;
G1
set @@session.optimizer_switch = @old_optimizer_switch,
@@session.optimizer_use_mrr = @old_optimizer_use_mrr,
@@session.engine_condition_pushdown = @old_engine_condition_pushdown;
DROP TABLE t1;
#
# BUG#45863 "Assertion failed: (fixed == 0), function fix_fields(),
# file item.cc, line 4448"
#
DROP TABLE IF EXISTS C, BB;
CREATE TABLE C (
varchar_nokey varchar(1) NOT NULL
);
INSERT INTO C VALUES
('k'),('a'),(''),('u'),('e'),('v'),('i'),
('t'),('u'),('f'),('u'),('m'),('j'),('f'),
('v'),('j'),('g'),('e'),('h'),('z');
CREATE TABLE BB (
varchar_nokey varchar(1) NOT NULL
);
INSERT INTO BB VALUES ('i'),('t');
SELECT varchar_nokey FROM C
WHERE (varchar_nokey, OUTR) IN (SELECT varchar_nokey
FROM BB);
ERROR 21000: Operand should contain 2 column(s)
SELECT varchar_nokey FROM C
WHERE (varchar_nokey, OUTR) IN (SELECT varchar_nokey, varchar_nokey
FROM BB);
ERROR 42S22: Unknown column 'OUTR' in 'IN/ALL/ANY subquery'
DROP TABLE C,BB;
#
# During work with BUG#45863 I had problems with a query that was
# optimized differently in regular and prepared mode.
# Because there was a bug in one of the selected strategies, I became
# aware of the problem. Adding an EXPLAIN query to catch this.
DROP TABLE IF EXISTS t1, t2, t3;
CREATE TABLE t1
(EMPNUM CHAR(3) NOT NULL,
EMPNAME CHAR(20),
GRADE DECIMAL(4),
CITY CHAR(15));
CREATE TABLE t2
(PNUM CHAR(3) NOT NULL,
PNAME CHAR(20),
PTYPE CHAR(6),
BUDGET DECIMAL(9),
CITY CHAR(15));
CREATE TABLE t3
(EMPNUM CHAR(3) NOT NULL,
PNUM CHAR(3) NOT NULL,
HOURS DECIMAL(5));
INSERT INTO t1 VALUES ('E1','Alice',12,'Deale');
INSERT INTO t1 VALUES ('E2','Betty',10,'Vienna');
INSERT INTO t1 VALUES ('E3','Carmen',13,'Vienna');
INSERT INTO t1 VALUES ('E4','Don',12,'Deale');
INSERT INTO t1 VALUES ('E5','Ed',13,'Akron');
INSERT INTO t2 VALUES ('P1','MXSS','Design',10000,'Deale');
INSERT INTO t2 VALUES ('P2','CALM','Code',30000,'Vienna');
INSERT INTO t2 VALUES ('P3','SDP','Test',30000,'Tampa');
INSERT INTO t2 VALUES ('P4','SDP','Design',20000,'Deale');
INSERT INTO t2 VALUES ('P5','IRM','Test',10000,'Vienna');
INSERT INTO t2 VALUES ('P6','PAYR','Design',50000,'Deale');
INSERT INTO t3 VALUES ('E1','P1',40);
INSERT INTO t3 VALUES ('E1','P2',20);
INSERT INTO t3 VALUES ('E1','P3',80);
INSERT INTO t3 VALUES ('E1','P4',20);
INSERT INTO t3 VALUES ('E1','P5',12);
INSERT INTO t3 VALUES ('E1','P6',12);
INSERT INTO t3 VALUES ('E2','P1',40);
INSERT INTO t3 VALUES ('E2','P2',80);
INSERT INTO t3 VALUES ('E3','P2',20);
INSERT INTO t3 VALUES ('E4','P2',20);
INSERT INTO t3 VALUES ('E4','P4',40);
INSERT INTO t3 VALUES ('E4','P5',80);
SET @old_optimizer_switch = @@session.optimizer_switch;
SET @old_join_cache_level = @@session.join_cache_level;
SET SESSION optimizer_switch = 'firstmatch=on,loosescan=on,materialization=on,in_to_exists=off,semijoin=on';
SET SESSION join_cache_level = 1;
CREATE UNIQUE INDEX t1_IDX ON t1(EMPNUM);
EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'))";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL t1_IDX NULL NULL NULL 5
1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
DEALLOCATE PREPARE stmt;
DROP INDEX t1_IDX ON t1;
CREATE INDEX t1_IDX ON t1(EMPNUM);
EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'))";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL t1_IDX NULL NULL NULL 5
1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
DEALLOCATE PREPARE stmt;
DROP INDEX t1_IDX ON t1;
EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'))";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
DEALLOCATE PREPARE stmt;
SET SESSION optimizer_switch = @old_optimizer_switch;
SET SESSION join_cache_level = @old_join_cache_level;
DROP TABLE t1, t2, t3;
#
# BUG#45221 Query SELECT pk FROM C WHERE pk IN (SELECT int_key) failing
#
CREATE TABLE t1 (
i1_key INT,
i2 INT,
i3 INT,
KEY i1_index (i1_key)
);
INSERT INTO t1 VALUES (9,1,2), (9,2,1);
CREATE TABLE t2 (
pk INT NOT NULL,
i1 INT,
PRIMARY KEY (pk)
);
INSERT INTO t2 VALUES (9,1);
# Enable Index condition pushdown
SELECT @old_icp:=@@engine_condition_pushdown;
@old_icp:=@@engine_condition_pushdown
#
SET SESSION engine_condition_pushdown = 'ON';
SELECT pk
FROM t2
WHERE
pk IN (
SELECT i1_key
FROM t1
WHERE t1.i2 < t1.i3 XOR t2.i1 > 1
ORDER BY t1.i2 desc);
pk
9
# Restore old value for Index condition pushdown
SET SESSION engine_condition_pushdown=@old_icp;
DROP TABLE t1,t2;
#
# BUG#45863 "Assertion failed: (fixed == 0), function fix_fields(),
# file item.cc, line 4448"
#
DROP TABLE IF EXISTS C, BB;
CREATE TABLE C (
varchar_nokey varchar(1) NOT NULL
);
INSERT INTO C VALUES
('k'),('a'),(''),('u'),('e'),('v'),('i'),
('t'),('u'),('f'),('u'),('m'),('j'),('f'),
('v'),('j'),('g'),('e'),('h'),('z');
CREATE TABLE BB (
varchar_nokey varchar(1) NOT NULL
);
INSERT INTO BB VALUES ('i'),('t');
SELECT varchar_nokey FROM C
WHERE (varchar_nokey, OUTR) IN (SELECT varchar_nokey
FROM BB);
ERROR 21000: Operand should contain 2 column(s)
SELECT varchar_nokey FROM C
WHERE (varchar_nokey, OUTR) IN (SELECT varchar_nokey, varchar_nokey
FROM BB);
ERROR 42S22: Unknown column 'OUTR' in 'IN/ALL/ANY subquery'
DROP TABLE C,BB;
#
# During work with BUG#45863 I had problems with a query that was
# optimized differently in regular and prepared mode.
# Because there was a bug in one of the selected strategies, I became
# aware of the problem. Adding an EXPLAIN query to catch this.
DROP TABLE IF EXISTS t1, t2, t3;
CREATE TABLE t1
(EMPNUM CHAR(3) NOT NULL,
EMPNAME CHAR(20),
GRADE DECIMAL(4),
CITY CHAR(15));
CREATE TABLE t2
(PNUM CHAR(3) NOT NULL,
PNAME CHAR(20),
PTYPE CHAR(6),
BUDGET DECIMAL(9),
CITY CHAR(15));
CREATE TABLE t3
(EMPNUM CHAR(3) NOT NULL,
PNUM CHAR(3) NOT NULL,
HOURS DECIMAL(5));
INSERT INTO t1 VALUES ('E1','Alice',12,'Deale');
INSERT INTO t1 VALUES ('E2','Betty',10,'Vienna');
INSERT INTO t1 VALUES ('E3','Carmen',13,'Vienna');
INSERT INTO t1 VALUES ('E4','Don',12,'Deale');
INSERT INTO t1 VALUES ('E5','Ed',13,'Akron');
INSERT INTO t2 VALUES ('P1','MXSS','Design',10000,'Deale');
INSERT INTO t2 VALUES ('P2','CALM','Code',30000,'Vienna');
INSERT INTO t2 VALUES ('P3','SDP','Test',30000,'Tampa');
INSERT INTO t2 VALUES ('P4','SDP','Design',20000,'Deale');
INSERT INTO t2 VALUES ('P5','IRM','Test',10000,'Vienna');
INSERT INTO t2 VALUES ('P6','PAYR','Design',50000,'Deale');
INSERT INTO t3 VALUES ('E1','P1',40);
INSERT INTO t3 VALUES ('E1','P2',20);
INSERT INTO t3 VALUES ('E1','P3',80);
INSERT INTO t3 VALUES ('E1','P4',20);
INSERT INTO t3 VALUES ('E1','P5',12);
INSERT INTO t3 VALUES ('E1','P6',12);
INSERT INTO t3 VALUES ('E2','P1',40);
INSERT INTO t3 VALUES ('E2','P2',80);
INSERT INTO t3 VALUES ('E3','P2',20);
INSERT INTO t3 VALUES ('E4','P2',20);
INSERT INTO t3 VALUES ('E4','P4',40);
INSERT INTO t3 VALUES ('E4','P5',80);
SET @old_optimizer_switch = @@session.optimizer_switch;
SET @old_join_cache_level = @@session.join_cache_level;
SET SESSION optimizer_switch = 'firstmatch=on,loosescan=on,materialization=on,in_to_exists=off,semijoin=on';
SET SESSION join_cache_level = 1;
CREATE UNIQUE INDEX t1_IDX ON t1(EMPNUM);
EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'))";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL t1_IDX NULL NULL NULL 5
1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
DEALLOCATE PREPARE stmt;
DROP INDEX t1_IDX ON t1;
CREATE INDEX t1_IDX ON t1(EMPNUM);
EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'))";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL t1_IDX NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL t1_IDX NULL NULL NULL 5
1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
DEALLOCATE PREPARE stmt;
DROP INDEX t1_IDX ON t1;
EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
FROM t1
WHERE EMPNUM IN
(SELECT EMPNUM
FROM t3
WHERE PNUM IN
(SELECT PNUM
FROM t2
WHERE PTYPE = 'Design'))";
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
EXECUTE stmt;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
1 SIMPLE subselect2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 Using where
2 SUBQUERY t3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
DEALLOCATE PREPARE stmt;
SET SESSION optimizer_switch = @old_optimizer_switch;
SET SESSION join_cache_level = @old_join_cache_level;
DROP TABLE t1, t2, t3;
#
# BUG#716293: "Range checked for each record" is not used if condition refers to outside of subquery
#
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, b int, `filler` char(200), key(a), key (b));
insert into t2
select A.a + 10*B.a + 100 * C.a, A.a + 10*B.a + 100 * C.a, 'filler' from t1 A, t1 B, t1 C;
# The following must use "Range checked for each record" for table B
explain
select a,
(select sum(X.a+B.b) from t1 X, t2 B where B.a=A.a or B.b=A.a)
from t1 A;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY A ALL NULL NULL NULL NULL 10
2 DEPENDENT SUBQUERY X ALL NULL NULL NULL NULL 10
2 DEPENDENT SUBQUERY B ALL a,b NULL NULL NULL 1000 Range checked for each record (index map: 0x3)
drop table t1, t2;
#
# BUG#723822: Crash in get_constant_key_infix with EXISTS ( SELECT .. DISTINCT )
#
CREATE TABLE t1 ( f1 int(11), f3 varchar(1)) ;
INSERT INTO t1 VALUES ('8','c'),('5','f');
ALTER TABLE t1 ADD KEY (f3,f1);
CREATE TABLE t2 ( f4 varchar(1)) ;
INSERT INTO t2 VALUES ('f'),('d');
SELECT * FROM t2
WHERE EXISTS (
SELECT DISTINCT f3
FROM t1
WHERE f3 <= t2.f4
);
f4
f
d
drop table t1,t2;
#
# LP BUG#718763 Second crash in select_describe() and materialization
#
CREATE TABLE t1 ( f1 int(11), f3 int(11), f10 varchar(1), KEY (f3)) ;
INSERT INTO t1 VALUES ('28','6','m'),('29','4','c');
CREATE TABLE t2 (f11 varchar(1)) ;
INSERT INTO t2 VALUES ('f'),('d');
SET @old_optimizer_switch = @@session.optimizer_switch;
SET SESSION optimizer_switch = 'materialization=on,in_to_exists=off,';
EXPLAIN
SELECT * FROM t1
WHERE f3 = (
SELECT t1.f3 FROM t1
WHERE ( t1.f10 ) IN ( SELECT f11 FROM t2 GROUP BY f11 ));
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 t1 ALL NULL NULL NULL NULL 2 Using where
3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using temporary
SELECT * FROM t1
WHERE f3 = (
SELECT t1.f3 FROM t1
WHERE ( t1.f10 ) IN ( SELECT f11 FROM t2 GROUP BY f11 ));
f1 f3 f10
EXPLAIN
SELECT * FROM t1
WHERE f3 = (
SELECT f3 FROM t1
WHERE ( f10, f10 ) IN ( SELECT f11, f11 FROM t2 GROUP BY f11 ));
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 t1 ALL NULL NULL NULL NULL 2 Using where
3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using temporary
SELECT * FROM t1
WHERE f3 = (
SELECT f3 FROM t1
WHERE ( f10, f10 ) IN ( SELECT f11, f11 FROM t2 GROUP BY f11 ));
f1 f3 f10
SET SESSION optimizer_switch = @old_optimizer_switch;
drop table t1,t2;
#
# LP BUG#715738: Wrong result with implicit grouping and empty result set
#
CREATE TABLE t1 (f1 int, f2 int);
CREATE TABLE t2 (f3 int, f4 int not null, PRIMARY KEY (f3));
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch = 'materialization=on,in_to_exists=off,semijoin=off';
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2);
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 t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2);
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 t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2);
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 t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2);
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 t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2);
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 t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in;
not_in
1
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2);
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No matching min/max row
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2);
f1 f2
SET @@optimizer_switch = 'materialization=off,in_to_exists=on,semijoin=off';
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2);
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2);
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2);
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2);
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2);
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) > 7) as not_in;
not_in
1
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 HAVING max(f4) is null) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in;
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 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2);
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No matching min/max row
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2);
f1 f2
INSERT INTO t1 VALUES (1, 2);
INSERT INTO t1 VALUES (3, 4);
INSERT INTO t2 VALUES (5, 6);
INSERT INTO t2 VALUES (7, 8);
SET @@optimizer_switch = 'materialization=on,in_to_exists=off,semijoin=off';
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
not_in
1
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No matching min/max row
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2 WHERE f3 > 10);
f1 f2
SET @@optimizer_switch = 'materialization=off,in_to_exists=on,semijoin=off';
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
f1 f2
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
not_in
1
EXPLAIN
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
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 DEPENDENT SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
not_in
NULL
EXPLAIN
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2 WHERE f3 > 10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No matching min/max row
SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT min(f3)+f3, min(f4)+f3+max(f4) FROM t2 WHERE f3 > 10);
f1 f2
set @@optimizer_switch=@save_optimizer_switch;
drop table t1,t2;
#
# LP BUG#613029 Wrong result with materialization and semijoin, and
# valgrind warnings in Protocol::net_store_data with materialization
# for implicit grouping
#
CREATE TABLE t1 (
pk int(11) NOT NULL AUTO_INCREMENT,
f2 int(11) NOT NULL,
f3 varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY f2 (f2));
INSERT INTO t1 VALUES (1,9,'x');
INSERT INTO t1 VALUES (2,5,'g');
CREATE TABLE t2 (
pk int(11) NOT NULL AUTO_INCREMENT,
f2 int(11) NOT NULL,
f3 varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY f2 (f2));
INSERT INTO t2 VALUES (1,7,'p');
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='materialization=off,in_to_exists=on,semijoin=off';
EXPLAIN
SELECT t1.f3, MAX(t1.f2)
FROM t1, t2
WHERE (t2.pk = t1.pk) AND t2.pk IN (SELECT f2 FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system PRIMARY NULL NULL NULL 1
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
2 DEPENDENT SUBQUERY t1 index_subquery f2 f2 4 func 2 Using index
SELECT t1.f3, MAX(t1.f2)
FROM t1, t2
WHERE (t2.pk = t1.pk) AND t2.pk IN (SELECT f2 FROM t1);
f3 MAX(t1.f2)
NULL NULL
set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off';
EXPLAIN
SELECT t1.f3, MAX(t1.f2)
FROM t1, t2
WHERE (t2.pk = t1.pk) AND t2.pk IN (SELECT f2 FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system PRIMARY NULL NULL NULL 1
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1
2 SUBQUERY t1 index NULL f2 4 NULL 2 Using index
SELECT t1.f3, MAX(t1.f2)
FROM t1, t2
WHERE (t2.pk = t1.pk) AND t2.pk IN (SELECT f2 FROM t1);
f3 MAX(t1.f2)
NULL NULL
TODO: add a test case for semijoin when the wrong result is fixed
set @@optimizer_switch='materialization=off,semijoin=on';
set @@optimizer_switch=@save_optimizer_switch;
drop table t1, t2;
#
# LP BUG#641203 Query returns rows where no result is expected (impossible WHERE)
#
CREATE TABLE t1 (c1 varchar(1) DEFAULT NULL);
CREATE TABLE t2 (c1 varchar(1) DEFAULT NULL);
INSERT INTO t2 VALUES ('k'), ('d');
CREATE TABLE t3 (c1 varchar(1) DEFAULT NULL);
INSERT INTO t3 VALUES ('a'), ('b'), ('c');
CREATE TABLE t4 (c1 varchar(1) primary key);
INSERT INTO t4 VALUES ('k'), ('d');
EXPLAIN
SELECT * FROM t1 RIGHT JOIN t2 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t1 RIGHT JOIN t2 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
c1 c1
EXPLAIN
SELECT * FROM t2 LEFT JOIN t1 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t2 LEFT JOIN t1 ON t1.c1 WHERE 's' IN (SELECT c1 FROM t2);
c1 c1
EXPLAIN
SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM (t2 LEFT JOIN t1 ON t1.c1) LEFT JOIN t3 on t3.c1 WHERE 's' IN (SELECT c1 FROM t2);
c1 c1 c1
EXPLAIN
SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t4 index NULL PRIMARY 3 NULL 2 Using index
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t4 LEFT JOIN t2 ON t4.c1 WHERE 's' IN (SELECT c1 FROM t2);
c1 c1
drop table t1, t2, t3, t4;
#
# LP BUG#675981 Assertion `cache != __null' failed in sub_select_cache()
# on EXPLAIN
#
CREATE TABLE t1 (f1 int,f2 int) ;
INSERT IGNORE INTO t1 VALUES ('2','5'),('2',NULL);
CREATE TABLE t2 (f1 int, f5 int) ;
INSERT IGNORE INTO t2 VALUES (1,0);
CREATE TABLE t3 (f4 int) ;
INSERT IGNORE INTO t3 VALUES (0),(0);
set @@optimizer_switch='in_to_exists=on,materialization=off,semijoin=off';
EXPLAIN
SELECT * FROM t2
WHERE f1 IN (SELECT t1.f2 FROM t1 JOIN t3 ON t3.f4);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
drop table t1, t2, t3;
#
# LP BUG#680005 Second assertion `cache != __null' failed in
# sub_select_cache() on EXPLAIN
#
CREATE TABLE t1 (f1 int,f2 int,f4 int,f6 int,KEY (f4)) ;
INSERT IGNORE INTO t1 VALUES
('1','5','1','0'),('2','1','1','0'),('2','2','2','0'),('0',NULL,'0','0'),
('2','1','2','0'),('2','0','0','0'),('2','2','2','0'),('2','8','2','0'),
('2','7','2','0'),('2','5','2','0'),('2',NULL,'1','0');
CREATE TABLE t2 (f3 int) ;
INSERT IGNORE INTO t2 VALUES ('7');
CREATE TABLE t3 (f3 int) ;
INSERT IGNORE INTO t3 VALUES ('2');
EXPLAIN
SELECT t1.f4
FROM t2 JOIN t1 ON t1.f6
WHERE
( t1.f2 ) IN (SELECT SUBQUERY2_t1.f3
FROM t3 AS SUBQUERY2_t1
JOIN
(t1 AS SUBQUERY2_t2
JOIN
t1 AS SUBQUERY2_t3 ON SUBQUERY2_t3.f1)
ON SUBQUERY2_t3.f2)
GROUP BY t1.f4 ORDER BY t1.f1 LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1 Using temporary; Using filesort
1 PRIMARY t1 index NULL f4 5 NULL 11 Using where
2 DEPENDENT SUBQUERY SUBQUERY2_t1 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY SUBQUERY2_t2 index NULL f4 5 NULL 11 Using index
2 DEPENDENT SUBQUERY SUBQUERY2_t3 ALL NULL NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
drop table t1, t2, t3;
#
# LP BUG#680038 bool close_thread_table(THD*, TABLE**):
# Assertion `table->key_read == 0' failed in EXPLAIN
#
CREATE TABLE t1 (f1 int,f3 int,f4 int) ;
INSERT IGNORE INTO t1 VALUES (NULL,1,0);
CREATE TABLE t2 (f2 int,f4 int,f5 int) ;
INSERT IGNORE INTO t2 VALUES (8,0,0),(5,0,0);
CREATE TABLE t3 (f4 int,KEY (f4)) ;
INSERT IGNORE INTO t3 VALUES (0),(0);
set @@optimizer_switch='semijoin=off';
EXPLAIN
SELECT * FROM t1 WHERE
(SELECT f2 FROM t2
WHERE f4 <= ALL
(SELECT SQ1_t1.f4
FROM t3 AS SQ1_t1 JOIN t3 AS SQ1_t3 ON SQ1_t3.f4
GROUP BY SQ1_t1.f4));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
3 SUBQUERY SQ1_t1 index NULL f4 5 NULL 2 Using index; Using temporary
3 SUBQUERY SQ1_t3 index NULL f4 5 NULL 2 Using where; Using index; Using join buffer (flat, BNL join)
drop table t1, t2, t3;
#
# BUG#52317: Assertion failing in Field_varstring::store()
# at field.cc:6833
#
CREATE TABLE t1 (i INTEGER);
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (i INTEGER, KEY k(i));
INSERT INTO t2 VALUES (1), (2);
EXPLAIN
SELECT i FROM t1 WHERE (1) NOT IN (SELECT i FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t2 index_subquery k k 5 const 2 Using index
DROP TABLE t2;
DROP TABLE t1;
#
# LP BUG#680846: Crash in clear_tables() with subqueries
#
CREATE TABLE t1 (f3 int) ;
INSERT IGNORE INTO t1 VALUES (0),(0);
CREATE TABLE t2 (f1 int,f3 int,f4 varchar(32)) ;
INSERT IGNORE INTO t2 VALUES (1,0,'f');
EXPLAIN
SELECT COUNT(t2.f3),
(SELECT COUNT(f3) FROM t1 WHERE t2.f1) AS f9
FROM t2 JOIN t1 ON t1.f3
WHERE ('v') IN (SELECT f4 FROM t2)
GROUP BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT COUNT(f3) FROM t1 WHERE t2.f1) AS f9
FROM t2 JOIN t1 ON t1.f3
WHERE ('v') IN (SELECT f4 FROM t2)
GROUP BY f9;
COUNT(t2.f3) f9
EXPLAIN
SELECT COUNT(t2.f3),
(SELECT COUNT(f3) FROM t1 WHERE t2.f1) AS f9
FROM t2 JOIN t1 ON t1.f3
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT COUNT(f3) FROM t1 WHERE t2.f1) AS f9
FROM t2 JOIN t1 ON t1.f3
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
COUNT(t2.f3) f9
0 2
EXPLAIN
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
FROM t2 JOIN t1
WHERE ('v') IN (SELECT f4 FROM t2)
GROUP BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
FROM t2 JOIN t1
WHERE ('v') IN (SELECT f4 FROM t2)
GROUP BY f9;
COUNT(t2.f3) f9
EXPLAIN
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
FROM t2 JOIN t1
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT COUNT(t2.f3),
(SELECT t2.f1 FROM t1 limit 1) AS f9
FROM t2 JOIN t1
WHERE ('v') IN (SELECT f4 FROM t2)
ORDER BY f9;
COUNT(t2.f3) f9
0 NULL
drop table t1,t2;
#
# LP BUG#682683 Crash in create_tmp_table called from
# JOIN::init_execution
#
CREATE TABLE t2 (f1 int) ;
INSERT INTO t2 VALUES (1),(2);
CREATE TABLE t1 (f1 int) ;
EXPLAIN
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 GROUP BY field1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 GROUP BY field1;
field1
NULL
EXPLAIN
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 ORDER BY field1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 system NULL NULL NULL NULL 0 const row not found
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 ORDER BY field1;
field1
NULL
NULL
INSERT INTO t1 VALUES (1),(2);
EXPLAIN
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 GROUP BY field1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 GROUP BY field1;
ERROR 21000: Subquery returns more than 1 row
EXPLAIN
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 ORDER BY field1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT (SELECT f1 FROM t1) AS field1 FROM t2 ORDER BY field1;
ERROR 21000: Subquery returns more than 1 row
drop table t1,t2;
#
# LP BUG#680943 Assertion `!table || (!table->read_set ||
# bitmap_is_set(table->read_set, field_index))' failed with subquery
#
CREATE TABLE t1 (f1 int,f3 int) ;
INSERT IGNORE INTO t1 VALUES ('6','0'),('4','0');
CREATE TABLE t2 (f1 int,f2 int,f3 int) ;
INSERT IGNORE INTO t2 VALUES ('6','0','0'),('2','0','0');
SELECT f2
FROM (SELECT * FROM t2) AS alias1
WHERE (SELECT SQ2_t2.f1
FROM t1 JOIN t1 AS SQ2_t2 ON SQ2_t2.f3
WHERE SQ2_t2.f3 AND alias1.f1)
ORDER BY f3 ;
f2
drop table t1,t2;
#
# LP BUG#715062: Wrong result with VIEW + UNION + subquery in maria-5.3-mwl89
#
create table t1 (f1 int);
create table t2 (f2 int);
create table t3 (f3 int);
insert into t1 values (2);
insert into t2 values (2);
insert into t3 values (7);
CREATE VIEW v1 AS SELECT 2 UNION SELECT 2 ;
CREATE VIEW v2 AS SELECT * from t1 UNION SELECT * from t2 ;
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch = 'in_to_exists=off,semijoin=off,materialization=on';
EXPLAIN
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN ( SELECT * FROM v1 );
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN ( SELECT * FROM v1 );
bug
EXPLAIN
SELECT ( 5 ) IN ( SELECT * FROM v1 );
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT ( 5 ) IN ( SELECT * FROM v1 );
( 5 ) IN ( SELECT * FROM v1 )
0
EXPLAIN
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN (SELECT * FROM v2);
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED t1 system NULL NULL NULL NULL 1
4 UNION t2 system NULL NULL NULL NULL 1
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN (SELECT * FROM v2);
bug
EXPLAIN
SELECT 'bug' FROM t3 WHERE ( 5 ) IN (SELECT * FROM v2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 system NULL NULL NULL NULL 1
2 SUBQUERY <derived3> system NULL NULL NULL NULL 1
3 DERIVED t1 system NULL NULL NULL NULL 1
4 UNION t2 system NULL NULL NULL NULL 1
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT 'bug' FROM t3 WHERE ( 5 ) IN (SELECT * FROM v2);
bug
EXPLAIN
SELECT ( 5 ) IN ( SELECT * FROM v2 );
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED t1 system NULL NULL NULL NULL 1
4 UNION t2 system NULL NULL NULL NULL 1
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT ( 5 ) IN ( SELECT * FROM v2 );
( 5 ) IN ( SELECT * FROM v2 )
0
SET @@optimizer_switch = 'in_to_exists=on,semijoin=off,materialization=off';
EXPLAIN
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN ( SELECT * FROM v1 );
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN ( SELECT * FROM v1 );
bug
EXPLAIN
SELECT ( 5 ) IN ( SELECT * FROM v1 );
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT ( 5 ) IN ( SELECT * FROM v1 );
( 5 ) IN ( SELECT * FROM v1 )
0
EXPLAIN
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN (SELECT * FROM v2);
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED t1 system NULL NULL NULL NULL 1
4 UNION t2 system NULL NULL NULL NULL 1
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT 'bug' FROM DUAL WHERE ( 5 ) IN (SELECT * FROM v2);
bug
EXPLAIN
SELECT 'bug' FROM t3 WHERE ( 5 ) IN (SELECT * FROM v2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED t1 system NULL NULL NULL NULL 1
4 UNION t2 system NULL NULL NULL NULL 1
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT 'bug' FROM t3 WHERE ( 5 ) IN (SELECT * FROM v2);
bug
EXPLAIN
SELECT ( 5 ) IN ( SELECT * FROM v2 );
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 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
3 DERIVED t1 system NULL NULL NULL NULL 1
4 UNION t2 system NULL NULL NULL NULL 1
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
SELECT ( 5 ) IN ( SELECT * FROM v2 );
( 5 ) IN ( SELECT * FROM v2 )
0
set @@optimizer_switch=@save_optimizer_switch;
drop table t1,t2,t3;
drop view v1,v2;
#
# LP BUG#715069 Wrong result with GROUP BY inside subquery and materialization=off
#
CREATE TABLE t0 ( f1 int(11), f2 int(11), f10 varchar(1), PRIMARY KEY (f1)) ;
INSERT INTO t0 VALUES (8,8,'u'),(10,5,'o');
CREATE TABLE t1 (f1a int, f2a int not null, f3a varchar(3) not null, PRIMARY KEY (f1a)) ;
INSERT INTO t1 VALUES
(8,8,'a1a'),
(10,5,'b1b');
CREATE TABLE t2 (f1b int, f2b int not null, f3b varchar(3) not null, PRIMARY KEY (f1b)) ;
INSERT INTO t2 VALUES
(10,5,'d1d');
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch = 'materialization=off';
EXPLAIN
SELECT alias2.f1 , alias2.f2
FROM t0 AS alias1
RIGHT JOIN t0 AS alias2 ON alias2.f10
WHERE ( alias2.f1 , alias2.f2 ) IN ( SELECT f2 , f1 FROM t0 GROUP BY f2 , f1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY alias1 index NULL PRIMARY 4 NULL 2 Using where; Using index
2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 2
SELECT alias2.f1 , alias2.f2
FROM t0 AS alias1
RIGHT JOIN t0 AS alias2 ON alias2.f10
WHERE ( alias2.f1 , alias2.f2 ) IN ( SELECT f2 , f1 FROM t0 GROUP BY f2 , f1 );
f1 f2
8 8
EXPLAIN
SELECT * FROM t2 WHERE (f1b, f2b) IN (SELECT f1a, f2a FROM t1 GROUP BY f1a, f2a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t2 WHERE (f1b, f2b) IN (SELECT f1a, f2a FROM t1 GROUP BY f1a, f2a);
f1b f2b f3b
10 5 d1d
EXPLAIN
SELECT * FROM t2 WHERE (f1b) IN (SELECT f1a FROM t1 GROUP BY f1a, f2a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t2 WHERE (f1b) IN (SELECT f1a FROM t1 GROUP BY f1a, f2a);
f1b f2b f3b
10 5 d1d
SET @@optimizer_switch = 'materialization=on';
EXPLAIN
SELECT alias2.f1 , alias2.f2
FROM t0 AS alias1
RIGHT JOIN t0 AS alias2 ON alias2.f10
WHERE ( alias2.f1 , alias2.f2 ) IN ( SELECT f2 , f1 FROM t0 GROUP BY f2 , f1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY alias2 ALL NULL NULL NULL NULL 2 Using where
1 PRIMARY alias1 index NULL PRIMARY 4 NULL 2 Using where; Using index
2 SUBQUERY t0 ALL NULL NULL NULL NULL 2
SELECT alias2.f1 , alias2.f2
FROM t0 AS alias1
RIGHT JOIN t0 AS alias2 ON alias2.f10
WHERE ( alias2.f1 , alias2.f2 ) IN ( SELECT f2 , f1 FROM t0 GROUP BY f2 , f1 );
f1 f2
8 8
EXPLAIN
SELECT * FROM t2 WHERE (f1b, f2b) IN (SELECT f1a, f2a FROM t1 GROUP BY f1a, f2a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t2 WHERE (f1b, f2b) IN (SELECT f1a, f2a FROM t1 GROUP BY f1a, f2a);
f1b f2b f3b
10 5 d1d
EXPLAIN
SELECT * FROM t2 WHERE (f1b) IN (SELECT f1a FROM t1 GROUP BY f1a, f2a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2
SELECT * FROM t2 WHERE (f1b) IN (SELECT f1a FROM t1 GROUP BY f1a, f2a);
f1b f2b f3b
10 5 d1d
set @@optimizer_switch=@save_optimizer_switch;
drop table t0,t1,t2;
#
# LP BUG#718593 Crash in substitute_for_best_equal_field -> eliminate_item_equal ->
# Item_field::find_item_equal -> Item_equal::contains
#
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch = 'semijoin=off';
CREATE TABLE t1 ( f3 int(11), f10 varchar(1), f11 varchar(1)) ;
INSERT IGNORE INTO t1 VALUES (6,'f','f'),(2,'d','d');
CREATE TABLE t2 ( f12 int(11), f13 int(11)) ;
insert into t2 values (1,2), (3,4);
EXPLAIN
SELECT * FROM t2
WHERE ( f12 ) IN (
SELECT alias2.f3
FROM t1 AS alias1 JOIN t1 AS alias2 ON alias2.f10 = alias1.f11
WHERE alias1.f11 OR alias1.f3 = 50 AND alias1.f10
);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY alias1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY alias2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
SELECT * FROM t2
WHERE ( f12 ) IN (
SELECT alias2.f3
FROM t1 AS alias1 JOIN t1 AS alias2 ON alias2.f10 = alias1.f11
WHERE alias1.f11 OR alias1.f3 = 50 AND alias1.f10
);
f12 f13
EXPLAIN
SELECT * FROM t2
WHERE ( f12 ) IN (
SELECT alias2.f3
FROM t1 AS alias1, t1 AS alias2
WHERE (alias2.f10 = alias1.f11) AND (alias1.f11 OR alias1.f3 = 50 AND alias1.f10));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY alias1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY alias2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
SELECT * FROM t2
WHERE ( f12 ) IN (
SELECT alias2.f3
FROM t1 AS alias1, t1 AS alias2
WHERE (alias2.f10 = alias1.f11) AND (alias1.f11 OR alias1.f3 = 50 AND alias1.f10));
f12 f13
set @@optimizer_switch=@save_optimizer_switch;
drop table t1, t2;
#
# LP BUG#715759 Wrong result with in_to_exists=on in maria-5.3-mwl89
#
set @save_optimizer_switch=@@optimizer_switch;
CREATE TABLE t1 (a1 int, a2 int) ;
INSERT INTO t1 VALUES (1, 2);
INSERT INTO t1 VALUES (3, 4);
CREATE TABLE t2 (b1 int, b2 int) ;
INSERT INTO t2 VALUES (1, 2);
SET @@optimizer_switch = 'in_to_exists=on,materialization=off,semijoin=off';
EXPLAIN SELECT * FROM t1 WHERE a1 IN (SELECT b1 FROM t2 WHERE b1 = b2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT * FROM t1 WHERE a1 IN (SELECT b1 FROM t2 WHERE b1 = b2);
a1 a2
set @@optimizer_switch=@save_optimizer_switch;
drop table t1, t2;
#
# LP BUG#772309 join_tab_cmp_straight(): Assertion `!jt2->emb_sj_nest' failed in maria-5.3-mwl89 with semijoin
#
CREATE TABLE t1 ( f2 int) ;
INSERT INTO t1 VALUES (0),(0);
CREATE TABLE t2 ( f1 int NOT NULL ) ;
INSERT INTO t2 VALUES (0),(0);
CREATE TABLE t3 ( f1 int NOT NULL , f2 int) ;
INSERT INTO t3 VALUES (0,0), (0,0);
EXPLAIN SELECT STRAIGHT_JOIN (
SELECT f2 FROM t1 WHERE ( f2 ) IN ( SELECT t3.f2 FROM t3 JOIN t2 ON t2.f1 = 1 )
);
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 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
SELECT STRAIGHT_JOIN (
SELECT f2 FROM t1 WHERE ( f2 ) IN ( SELECT t3.f2 FROM t3 JOIN t2 ON t2.f1 = 1 )
);
(
SELECT f2 FROM t1 WHERE ( f2 ) IN ( SELECT t3.f2 FROM t3 JOIN t2 ON t2.f1 = 1 )
)
NULL
drop table t1, t2, t3;
#
# LP BUG#777597 Wrong result with multipart keys, in_to_exists=on, NOT IN in MWL#89
#
CREATE TABLE t1 ( f4 int);
INSERT IGNORE INTO t1 VALUES (2),(2);
CREATE TABLE t2 ( f3 int, f10 int, KEY (f10,f3) );
INSERT IGNORE INTO t2 VALUES (6, 1), (6, 1);
CREATE TABLE t3 ( f10 int );
INSERT IGNORE INTO t3 VALUES (1);
SET SESSION optimizer_switch='in_to_exists=on,materialization=off';
EXPLAIN
SELECT * FROM t1 WHERE ( 6 ) NOT IN ( SELECT t2.f3 FROM t2 JOIN t3 ON t3.f10 = t2.f10);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY t2 ref_or_null f10 f10 10 const,const 2 Using where; Using index
SELECT * FROM t1 WHERE ( 6 ) NOT IN ( SELECT t2.f3 FROM t2 JOIN t3 ON t3.f10 = t2.f10);
f4
drop table t1,t2,t3;
#
# LP BUG#778413 Third crash in select_describe() in maria-5.3-mwl89
#
CREATE TABLE t1 ( f11 int) ;
INSERT INTO t1 VALUES (1),(1);
CREATE TABLE t2 ( f1 int NOT NULL) ;
INSERT INTO t2 VALUES (20);
CREATE TABLE t3 (f3 int) ;
INSERT INTO t3 VALUES (2),(2);
EXPLAIN SELECT * FROM t2
WHERE t2.f1 = (
SELECT MAX( f3 ) FROM t3
WHERE EXISTS (
SELECT DISTINCT f11
FROM t1));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1
2 SUBQUERY t3 ALL NULL NULL NULL NULL 2
3 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using temporary
drop table t1, t2, t3;
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