1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
#
# MDEV-3992 Server crash or valgrind errors in test_if_skip_sort_order/test_if_cheaper_ordering
# on GROUP BY with indexes on InnoDB table
#
CREATE TABLE t1 (
pk INT PRIMARY KEY,
a VARCHAR(1) NOT NULL,
KEY (pk)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,'a'),(2,'b');
EXPLAIN
SELECT COUNT(*), pk field1, pk AS field2
FROM t1 WHERE a = 'r' OR pk = 183
GROUP BY field1, field2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,pk pk 4 NULL 2 Using where
SELECT COUNT(*), pk field1, pk AS field2
FROM t1 WHERE a = 'r' OR pk = 183
GROUP BY field1, field2;
COUNT(*) field1 field2
EXPLAIN
SELECT COUNT(*), pk field1 FROM t1
WHERE a = 'r' OR pk = 183 GROUP BY field1, field1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,pk pk 4 NULL 2 Using where
SELECT COUNT(*), pk field1 FROM t1
WHERE a = 'r' OR pk = 183 GROUP BY field1, field1;
COUNT(*) field1
drop table t1;
End of 5.5 tests
|
