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Add bool GiST opclass to btree_gist

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Adds bool opclass to btree_gist extension, to allow creating GiST
indexes on bool columns. GiST indexes on a single bool column don't seem
particularly useful, but this allows defining exclusion constraings
involving a bool column, for example.

Author: Emre Hasegeli
Reviewed-by: Andrey Borodin
Discussion: https://postgr.es/m/CAE2gYzyDKJBZngssR84VGZEN=Ux=V9FV23QfPgo+7-yYnKKg4g@mail.gmail.com
This commit is contained in:
Tomas Vondra
2021-11-06 17:00:43 +01:00
parent dafcf887da
commit 57e3c5160b
8 changed files with 382 additions and 3 deletions
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96
contrib/btree_gist/expected/bool.out Normal file
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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)