blob: d87569f8668ea14e00ec355be47824a3892756e8 (
plain)
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
#
# Various tests for SUM(DISTINCT ...)
#
--source include/big_test.inc
--source include/have_innodb.inc
--source include/have_sequence.inc
set @save_tmp_table_size=@@tmp_table_size;
set @save_max_heap_table_size=@@max_heap_table_size;
#
# Test the case when distinct values doesn't fit in memory and
# filesort is used (see uniques.cc:merge_walk)
#
set storage_engine=MYISAM;
CREATE TABLE t1 (id INTEGER);
CREATE TABLE t2 (id INTEGER);
INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_1_to_1024 b;
# Just test that AVG(DISTINCT) is there
SELECT AVG(DISTINCT id) FROM t1 GROUP BY id % 13;
SELECT SUM(DISTINCT id)/COUNT(DISTINCT id) FROM t1 GROUP BY id % 13;
INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_1025_to_16384 b;
INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a,seq_1_to_16384 b
ORDER by (a.seq*0+b.seq)*rand();
# SELECT '++++++++++++++++++++++++++++++++++++++++++++++++++';
SELECT SUM(DISTINCT id) sm FROM t1;
SELECT SUM(DISTINCT id) sm FROM t2;
SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13;
# this limit for max_heap_table_size is set to force testing the case, when
# all distinct sum values can not fit in memory and must be stored in a
# temporary table
SET max_heap_table_size=16384;
# to check that max_heap_table_size was actually set (hard limit for minimum
# max_heap_table_size is set in mysqld.cc):
SHOW variables LIKE 'max_heap_table_size';
SELECT SUM(DISTINCT id) sm FROM t1;
SELECT SUM(DISTINCT id) sm FROM t2;
SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13;
--echo #
--echo # Bug mdev-4063: SUM(DISTINCT...) with small'max_heap_table_size
--echo # (bug #56927)
--echo #
SET max_heap_table_size=default;
INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_16385_to_32768 b;
TRUNCATE t2;
INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a,seq_1_to_32768 b
ORDER BY (a.seq*0+b.seq)*rand();
SELECT SUM(DISTINCT id) sm FROM t2;
SET max_heap_table_size=16384;
SELECT SUM(DISTINCT id) sm FROM t2;
DROP TABLE t1;
DROP TABLE t2;
SET @@tmp_table_size=@save_tmp_table_size;
SET @@max_heap_table_size=@save_max_heap_table_size;
--echo #
--echo # MDEV-4311: COUNT(DISTINCT...) requiring a file for UNIQUE (bug #68749)
--echo #
CREATE TABLE t2 (id INTEGER) ENGINE=InnoDB;
BEGIN;
INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a, seq_1_to_16384 b
ORDER BY b.seq*rand();
INSERT INTO t2 VALUE(NULL);
--echo # With default tmp_table_size / max_heap_table_size
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
set @@tmp_table_size=1024*256;
--echo # With reduced tmp_table_size
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
set @@tmp_table_size=@save_tmp_table_size;
SET @@max_heap_table_size=1024*256;
--echo # With reduced max_heap_table_size
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
SET @@max_heap_table_size=@save_max_heap_table_size;
--echo # Back to default tmp_table_size / max_heap_table_size
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
COMMIT;
DROP TABLE t2;
|
