mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-26 07:37:19 +02:00
9f984ba6d2
Commit 16fa9b2b30 introduced a faster way to build GiST indexes, by
sorting all the data. This commit adds the sortsupport functions needed
to make use of that feature for btree_gist.
Author: Andrey Borodin
Discussion: https://www.postgresql.org/message-id/2F3F7265-0D22-44DB-AD71-8554C743D943@yandex-team.ru
42 lines
1.0 KiB
SQL
42 lines
1.0 KiB
SQL
-- int2 check
|
|
|
|
CREATE TABLE int2tmp (a int2);
|
|
|
|
\copy int2tmp from 'data/int2.data'
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a < 237;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a <= 237;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a = 237;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a >= 237;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a > 237;
|
|
|
|
SELECT a, a <-> '237' FROM int2tmp ORDER BY a <-> '237' LIMIT 3;
|
|
|
|
SET client_min_messages = DEBUG1;
|
|
CREATE INDEX int2idx ON int2tmp USING gist ( a );
|
|
CREATE INDEX int2idx_b ON int2tmp USING gist ( a ) WITH (buffering=on);
|
|
DROP INDEX int2idx_b;
|
|
RESET client_min_messages;
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a < 237::int2;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a <= 237::int2;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a = 237::int2;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a >= 237::int2;
|
|
|
|
SELECT count(*) FROM int2tmp WHERE a > 237::int2;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '237' FROM int2tmp ORDER BY a <-> '237' LIMIT 3;
|
|
SELECT a, a <-> '237' FROM int2tmp ORDER BY a <-> '237' LIMIT 3;
|