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
|
-- bool check
CREATE TABLE booltmp (a bool);
INSERT INTO booltmp VALUES (false), (true);
SET enable_seqscan=on;
SELECT count(*) FROM booltmp WHERE a < true;
count
-------
1
(1 row)
SELECT count(*) FROM booltmp WHERE a <= true;
count
-------
2
(1 row)
SELECT count(*) FROM booltmp WHERE a = true;
count
-------
1
(1 row)
SELECT count(*) FROM booltmp WHERE a >= true;
count
-------
1
(1 row)
SELECT count(*) FROM booltmp WHERE a > true;
count
-------
0
(1 row)
CREATE INDEX boolidx ON booltmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM booltmp WHERE a < true;
count
-------
1
(1 row)
SELECT count(*) FROM booltmp WHERE a <= true;
count
-------
2
(1 row)
SELECT count(*) FROM booltmp WHERE a = true;
count
-------
1
(1 row)
SELECT count(*) FROM booltmp WHERE a >= true;
count
-------
1
(1 row)
SELECT count(*) FROM booltmp WHERE a > true;
count
-------
0
(1 row)
-- Test index-only scans
SET enable_bitmapscan=off;
EXPLAIN (COSTS OFF)
SELECT * FROM booltmp WHERE a;
QUERY PLAN
------------------------------------------
Index Only Scan using boolidx on booltmp
Index Cond: (a = true)
(2 rows)
SELECT * FROM booltmp WHERE a;
a
---
t
(1 row)
EXPLAIN (COSTS OFF)
SELECT * FROM booltmp WHERE NOT a;
QUERY PLAN
------------------------------------------
Index Only Scan using boolidx on booltmp
Index Cond: (a = false)
(2 rows)
SELECT * FROM booltmp WHERE NOT a;
a
---
f
(1 row)
|
