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Re: Assertion `!table || (!table->read_set || bitmap_is_set(table->read_set, field_index))' failed with subquery cache
Test case:
--disable_warnings
DROP TABLE /*! IF EXISTS */ CC;
DROP TABLE /*! IF EXISTS */ C;
--enable_warnings
CREATE TABLE `CC` (
`pk` int(11) NOT NULL AUTO_INCREMENT,
`col_int_nokey` int(11) DEFAULT NULL,
`col_int_key` int(11) DEFAULT NULL,
`col_varchar_key` varchar(1) DEFAULT NULL,
`col_varchar_nokey` varchar(1) DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `col_int_key` (`col_int_key`),
KEY `col_varchar_key` (`col_varchar_key`,`col_int_key`)
) ENGINE=MyISAM AUTO_INCREMENT=30 DEFAULT CHARSET=latin1;
INSERT INTO `CC` VALUES (10,7,8,'v','v');
INSERT INTO `CC` VALUES (11,1,9,'r','r');
INSERT INTO `CC` VALUES (12,5,9,'a','a');
INSERT INTO `CC` VALUES (13,3,186,'m','m');
INSERT INTO `CC` VALUES (14,6,NULL,'y','y');
INSERT INTO `CC` VALUES (15,92,2,'j','j');
INSERT INTO `CC` VALUES (16,7,3,'d','d');
INSERT INTO `CC` VALUES (17,NULL,0,'z','z');
INSERT INTO `CC` VALUES (18,3,133,'e','e');
INSERT INTO `CC` VALUES (19,5,1,'h','h');
INSERT INTO `CC` VALUES (20,1,8,'b','b');
INSERT INTO `CC` VALUES (21,2,5,'s','s');
INSERT INTO `CC` VALUES (22,NULL,5,'e','e');
INSERT INTO `CC` VALUES (23,1,8,'j','j');
INSERT INTO `CC` VALUES (24,0,6,'e','e');
INSERT INTO `CC` VALUES (25,210,51,'f','f');
INSERT INTO `CC` VALUES (26,8,4,'v','v');
INSERT INTO `CC` VALUES (27,7,7,'x','x');
INSERT INTO `CC` VALUES (28,5,6,'m','m');
INSERT INTO `CC` VALUES (29,NULL,4,'c','c');
CREATE TABLE `C` (
`pk` int(11) NOT NULL AUTO_INCREMENT,
`col_int_nokey` int(11) DEFAULT NULL,
`col_int_key` int(11) DEFAULT NULL,
`col_varchar_key` varchar(1) DEFAULT NULL,
`col_varchar_nokey` varchar(1) DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `col_int_key` (`col_int_key`),
KEY `col_varchar_key` (`col_varchar_key`,`col_int_key`)
) ENGINE=MyISAM AUTO_INCREMENT=21 DEFAULT CHARSET=latin1;
INSERT INTO `C` VALUES (1,NULL,2,'w','w');
INSERT INTO `C` VALUES (2,7,9,'m','m');
INSERT INTO `C` VALUES (3,9,3,'m','m');
INSERT INTO `C` VALUES (4,7,9,'k','k');
INSERT INTO `C` VALUES (5,4,NULL,'r','r');
INSERT INTO `C` VALUES (6,2,9,'t','t');
INSERT INTO `C` VALUES (7,6,3,'j','j');
INSERT INTO `C` VALUES (8,8,8,'u','u');
INSERT INTO `C` VALUES (9,NULL,8,'h','h');
INSERT INTO `C` VALUES (10,5,53,'o','o');
INSERT INTO `C` VALUES (11,NULL,0,NULL,NULL);
INSERT INTO `C` VALUES (12,6,5,'k','k');
INSERT INTO `C` VALUES (13,188,166,'e','e');
INSERT INTO `C` VALUES (14,2,3,'n','n');
INSERT INTO `C` VALUES (15,1,0,'t','t');
INSERT INTO `C` VALUES (16,1,1,'c','c');
INSERT INTO `C` VALUES (17,0,9,'m','m');
INSERT INTO `C` VALUES (18,9,5,'y','y');
INSERT INTO `C` VALUES (19,NULL,6,'f','f');
INSERT INTO `C` VALUES (20,4,2,'d','d');
SET @@optimizer_switch = 'subquery_cache=off';
/* cache is off */ SELECT SUM( DISTINCT table1 .`pk` ) , (
SELECT MAX( `col_int_nokey` )
FROM C
WHERE table1 .`pk` ) field3
FROM C table1
JOIN (
C table2
JOIN CC table3
ON table3 .`col_varchar_key` = table2 .`col_varchar_key`
)
ON table3 .`col_varchar_key` = table2 .`col_varchar_nokey`
GROUP BY field3 ;
SET @@optimizer_switch = 'subquery_cache=on';
/* cache is on */ SELECT SUM( DISTINCT table1 .`pk` ) , (
SELECT MAX( `col_int_nokey` )
FROM C
WHERE table1 .`pk` ) field3
FROM C table1
JOIN (
C table2
JOIN CC table3
ON table3 .`col_varchar_key` = table2 .`col_varchar_key`
)
ON table3 .`col_varchar_key` = table2 .`col_varchar_nokey`
GROUP BY field3 ;
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LPexportBug608824.xml