contrib/btree_gin/expected/bool.out - master - githubmirror/postgres

contrib/btree_gin/expected/bool.out
132 строки3 KB
Tom Lane
Produce more-optimal plans for bitmap scans on boolean columns.
08 ноя 2022, 18:36
08 ноя 2022, 18:36042c909
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
   ->  Bitmap Heap Scan on test_bool
         Recheck Cond: i
         ->  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
   ->  Bitmap Heap Scan on test_bool
         Recheck Cond: (i > true)
         ->  Bitmap Index Scan on idx_bool
               Index Cond: (i > true)
(6 rows)

-- probably sufficient to check just this one:
EXPLAIN (COSTS OFF) SELECT * FROM test_bool WHERE i=false ORDER BY i;
                QUERY PLAN                 
-------------------------------------------
 Sort
   Sort Key: i
   ->  Bitmap Heap Scan on test_bool
         Recheck Cond: (NOT i)
         ->  Bitmap Index Scan on idx_bool
               Index Cond: (i = false)
(6 rows)