mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-22 02:43:23 +02:00
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
1.1 KiB
SQL
42 lines
1.1 KiB
SQL
-- time check
|
|
|
|
CREATE TABLE timetmp (a time);
|
|
|
|
\copy timetmp from 'data/time.data'
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM timetmp WHERE a < '10:57:11';
|
|
|
|
SELECT count(*) FROM timetmp WHERE a <= '10:57:11';
|
|
|
|
SELECT count(*) FROM timetmp WHERE a = '10:57:11';
|
|
|
|
SELECT count(*) FROM timetmp WHERE a >= '10:57:11';
|
|
|
|
SELECT count(*) FROM timetmp WHERE a > '10:57:11';
|
|
|
|
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
|
|
|
|
SET client_min_messages = DEBUG1;
|
|
CREATE INDEX timeidx ON timetmp USING gist ( a );
|
|
CREATE INDEX timeidx_b ON timetmp USING gist ( a ) WITH (buffering=on);
|
|
DROP INDEX timeidx_b;
|
|
RESET client_min_messages;
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM timetmp WHERE a < '10:57:11'::time;
|
|
|
|
SELECT count(*) FROM timetmp WHERE a <= '10:57:11'::time;
|
|
|
|
SELECT count(*) FROM timetmp WHERE a = '10:57:11'::time;
|
|
|
|
SELECT count(*) FROM timetmp WHERE a >= '10:57:11'::time;
|
|
|
|
SELECT count(*) FROM timetmp WHERE a > '10:57:11'::time;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
|
|
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
|