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|
set enable_seqscan=off;
CREATE TABLE test_bool (
i boolean
);
INSERT INTO test_bool VALUES (false),(true),(null);
CREATE INDEX idx_bool ON test_bool USING gin (i);
SELECT * FROM test_bool WHERE i<true ORDER BY i;
i
---
f
(1 row)
SELECT * FROM test_bool WHERE i<=true ORDER BY i;
i
---
f
t
(2 rows)
SELECT * FROM test_bool WHERE i=true ORDER BY i;
i
---
t
(1 row)
SELECT * FROM test_bool WHERE i>=true ORDER BY i;
i
---
t
(1 row)
SELECT * FROM test_bool WHERE i>true ORDER BY i;
i
---
(0 rows)
SELECT * FROM test_bool WHERE i<false ORDER BY i;
i
---
(0 rows)
SELECT * FROM test_bool WHERE i<=false ORDER BY i;
i
---
f
(1 row)
SELECT * FROM test_bool WHERE i=false ORDER BY i;
i
---
f
(1 row)
SELECT * FROM test_bool WHERE i>=false ORDER BY i;
i
---
f
t
(2 rows)
SELECT * FROM test_bool WHERE i>false ORDER BY i;
i
---
t
(1 row)
EXPLAIN (COSTS OFF) SELECT * FROM test_bool WHERE i<true ORDER BY i;
QUERY PLAN
-------------------------------------------
Sort
Sort Key: i
-> Bitmap Heap Scan on test_bool
Recheck Cond: (i < true)
-> Bitmap Index Scan on idx_bool
Index Cond: (i < true)
(6 rows)
EXPLAIN (COSTS OFF) SELECT * FROM test_bool WHERE i<=true ORDER BY i;
QUERY PLAN
-------------------------------------------
Sort
Sort Key: i
-> Bitmap Heap Scan on test_bool
Recheck Cond: (i <= true)
-> Bitmap Index Scan on idx_bool
Index Cond: (i <= true)
(6 rows)
EXPLAIN (COSTS OFF) SELECT * FROM test_bool WHERE i=true ORDER BY i;
QUERY PLAN
-----------------------------
Sort
Sort Key: i
-> Seq Scan on test_bool
Filter: i
(4 rows)
EXPLAIN (COSTS OFF) SELECT * FROM test_bool WHERE i>=true ORDER BY i;
QUERY PLAN
-------------------------------------------
Sort
Sort Key: i
-> Bitmap Heap Scan on test_bool
Recheck Cond: (i >= true)
-> Bitmap Index Scan on idx_bool
Index Cond: (i >= true)
(6 rows)
EXPLAIN (COSTS OFF) SELECT * FROM test_bool WHERE i>true ORDER BY i;
QUERY PLAN
-------------------------------------------
Sort
Sort Key: i
-> Bitmap Heap Scan on test_bool
Recheck Cond: (i > true)
-> Bitmap Index Scan on idx_bool
Index Cond: (i > true)
(6 rows)
|
