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
1.4 KiB
SQL
42 lines
1.4 KiB
SQL
-- timestamp check
|
|
|
|
CREATE TABLE timestamptmp (a timestamp);
|
|
|
|
\copy timestamptmp from 'data/timestamp.data'
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a < '2004-10-26 08:55:08';
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a <= '2004-10-26 08:55:08';
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a = '2004-10-26 08:55:08';
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a >= '2004-10-26 08:55:08';
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a > '2004-10-26 08:55:08';
|
|
|
|
SELECT a, a <-> '2004-10-26 08:55:08' FROM timestamptmp ORDER BY a <-> '2004-10-26 08:55:08' LIMIT 3;
|
|
|
|
SET client_min_messages = DEBUG1;
|
|
CREATE INDEX timestampidx ON timestamptmp USING gist ( a );
|
|
CREATE INDEX timestampidx_b ON timestamptmp USING gist ( a ) WITH (buffering=on);
|
|
DROP INDEX timestampidx_b;
|
|
RESET client_min_messages;
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a < '2004-10-26 08:55:08'::timestamp;
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a <= '2004-10-26 08:55:08'::timestamp;
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a = '2004-10-26 08:55:08'::timestamp;
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a >= '2004-10-26 08:55:08'::timestamp;
|
|
|
|
SELECT count(*) FROM timestamptmp WHERE a > '2004-10-26 08:55:08'::timestamp;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '2004-10-26 08:55:08' FROM timestamptmp ORDER BY a <-> '2004-10-26 08:55:08' LIMIT 3;
|
|
SELECT a, a <-> '2004-10-26 08:55:08' FROM timestamptmp ORDER BY a <-> '2004-10-26 08:55:08' LIMIT 3;
|