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|
-- 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
Filter: a
(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
Filter: (NOT a)
(2 rows)
SELECT * FROM booltmp WHERE NOT a;
a
---
f
(1 row)
|
