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CREATE TABLE t1 (id int(11) NOT NULL PRIMARY KEY, name varchar(20),
INDEX (name)) ENGINE=InnoDB;
CREATE TABLE t2 (id int(11) NOT NULL PRIMARY KEY, fkey int(11),
FOREIGN KEY (fkey) REFERENCES t2(id)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,'A1'),(2,'A2'),(3,'B');
INSERT INTO t2 VALUES (1,1),(2,2),(3,2),(4,3),(5,3);
EXPLAIN
SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
WHERE t1.name LIKE 'A%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,name name 23 NULL 3 Using where; Using index
1 SIMPLE t2 ref fkey fkey 5 test.t1.id 1 Using index
EXPLAIN
SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
WHERE t1.name LIKE 'A%' OR FALSE;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL fkey 5 NULL 5 Using index
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.fkey 1 Using where
DROP TABLE t1,t2;
#
# BUG#58456: Assertion 0 in QUICK_INDEX_MERGE_SELECT::need_sorted_output
# in opt_range.h
#
CREATE TABLE t1 (
col_int INT,
col_int_key INT,
pk INT NOT NULL,
PRIMARY KEY (pk),
KEY col_int_key (col_int_key)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (NULL,1,1), (6,2,2), (5,3,3), (NULL,4,4);
INSERT INTO t1 VALUES (1,NULL,6), (8,5,7), (NULL,8,8), (8,NULL,5);
CREATE TABLE t2 (
pk INT PRIMARY KEY
) ENGINE=InnoDB;
EXPLAIN SELECT t1.pk
FROM t2 LEFT JOIN t1 ON t2.pk = t1.col_int
WHERE t1.col_int_key BETWEEN 5 AND 6
AND t1.pk IS NULL OR t1.pk IN (5)
ORDER BY pk;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
SELECT t1.pk
FROM t2 LEFT JOIN t1 ON t2.pk = t1.col_int
WHERE t1.col_int_key BETWEEN 5 AND 6
AND t1.pk IS NULL OR t1.pk IN (5)
ORDER BY pk;
pk
DROP TABLE t1,t2;
# End BUG#58456
CREATE TABLE t1(a int, b int, KEY (a), PRIMARY KEY (b)) ENGINE=InnoDB;
CREATE TABLE t2 (b int, PRIMARY KEY (b));
INSERT INTO t2 VALUES (4),(9);
SELECT STRAIGHT_JOIN t1.a FROM t1 RIGHT JOIN t2 ON t1.b = t2.b
WHERE (t1.b NOT BETWEEN 1 AND 7 OR t1.a IS NULL AND t1.b = t2.b) AND t2.b = 4
GROUP BY 1;
a
DROP TABLE t1,t2;
#
Bug #59487: WRONG RESULT WITH STRAIGHT_JOIN AND RIGHT JOIN
#
CREATE TABLE t1 (
pk int(11) NOT NULL,
col_varchar_10_latin1_key varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES (1,'1');
CREATE TABLE t2 (
pk int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES (1);
CREATE TABLE t3 (
pk int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t3 VALUES (1);
CREATE TABLE t4 (
pk int(11) NOT NULL,
col_int int(11) DEFAULT NULL,
col_int_key int(11) DEFAULT NULL,
col_varchar_10_latin1_key varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t4 VALUES (1,1,1,'1');
CREATE TABLE t5 (
col_int int(11) DEFAULT NULL,
col_varchar_10_utf8_key varchar(10) CHARACTER SET utf8 DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t5 VALUES (1,'1');
CREATE TABLE t6 (
col_int_key int(11) DEFAULT NULL,
col_varchar_10_latin1_key varchar(10) DEFAULT NULL,
pk int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t6 VALUES (1,'1',1);
SELECT STRAIGHT_JOIN t6a.pk, t2.pk
FROM t6 AS t6a
LEFT JOIN
(
t2
RIGHT JOIN
(
(t1 LEFT JOIN (t4 JOIN t3 ON t4.col_int) ON t4.col_int_key = t1.pk)
LEFT JOIN
(t5 JOIN t6 AS t6b
ON t5.col_varchar_10_utf8_key = t6b.col_varchar_10_latin1_key)
ON t1.pk = t5.col_int
)
ON t4.col_varchar_10_latin1_key = t1.col_varchar_10_latin1_key
AND t5.col_varchar_10_utf8_key = 0
)
ON t6a.pk IS TRUE
WHERE t6b.col_int_key IS TRUE;
pk pk
1 NULL
EXPLAIN SELECT STRAIGHT_JOIN t6a.pk, t2.pk
FROM t6 AS t6a
LEFT JOIN
(
t2
RIGHT JOIN
(
(t1 LEFT JOIN (t4 JOIN t3 ON t4.col_int) ON t4.col_int_key = t1.pk)
LEFT JOIN
(t5 JOIN t6 AS t6b
ON t5.col_varchar_10_utf8_key = t6b.col_varchar_10_latin1_key)
ON t1.pk = t5.col_int
)
ON t4.col_varchar_10_latin1_key = t1.col_varchar_10_latin1_key
AND t5.col_varchar_10_utf8_key = 0
)
ON t6a.pk IS TRUE
WHERE t6b.col_int_key IS TRUE;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t6a ALL NULL NULL NULL NULL 1 Using where
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using join buffer (flat, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 1 Using join buffer (incremental, BNL join)
1 SIMPLE t5 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t6b ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
SELECT t6a.pk, t2.pk
FROM t6 AS t6a
LEFT JOIN
(
t2
RIGHT JOIN
(
(t1 LEFT JOIN (t4 JOIN t3 ON t4.col_int) ON t4.col_int_key = t1.pk)
LEFT JOIN
(t5 JOIN t6 AS t6b
ON t5.col_varchar_10_utf8_key = t6b.col_varchar_10_latin1_key)
ON t1.pk = t5.col_int
)
ON t4.col_varchar_10_latin1_key = t1.col_varchar_10_latin1_key
AND t5.col_varchar_10_utf8_key = 0
)
ON t6a.pk IS TRUE
WHERE t6b.col_int_key IS TRUE;
pk pk
1 NULL
EXPLAIN SELECT t6a.pk, t2.pk
FROM t6 AS t6a
LEFT JOIN
(
t2
RIGHT JOIN
(
(t1 LEFT JOIN (t4 JOIN t3 ON t4.col_int) ON t4.col_int_key = t1.pk)
LEFT JOIN
(t5 JOIN t6 AS t6b
ON t5.col_varchar_10_utf8_key = t6b.col_varchar_10_latin1_key)
ON t1.pk = t5.col_int
)
ON t4.col_varchar_10_latin1_key = t1.col_varchar_10_latin1_key
AND t5.col_varchar_10_utf8_key = 0
)
ON t6a.pk IS TRUE
WHERE t6b.col_int_key IS TRUE;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t6a ALL NULL NULL NULL NULL 1 Using where
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using join buffer (flat, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 1 Using join buffer (incremental, BNL join)
1 SIMPLE t5 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t6b ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
drop table t1,t2,t3,t4,t5,t6;
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