mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-23 21:37:19 +02:00
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
43 lines
888 B
SQL
43 lines
888 B
SQL
-- bool check
|
|
|
|
CREATE TABLE booltmp (a bool);
|
|
|
|
INSERT INTO booltmp VALUES (false), (true);
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a < true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a <= true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a = true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a >= true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a > true;
|
|
|
|
CREATE INDEX boolidx ON booltmp USING gist ( a );
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a < true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a <= true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a = true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a >= true;
|
|
|
|
SELECT count(*) FROM booltmp WHERE a > true;
|
|
|
|
-- Test index-only scans
|
|
SET enable_bitmapscan=off;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT * FROM booltmp WHERE a;
|
|
SELECT * FROM booltmp WHERE a;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT * FROM booltmp WHERE NOT a;
|
|
SELECT * FROM booltmp WHERE NOT a;
|