mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-25 02:57:19 +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
74 lines
1.4 KiB
Plaintext
74 lines
1.4 KiB
Plaintext
-- char check
|
|
CREATE TABLE vchartmp (a varchar(32));
|
|
\copy vchartmp from 'data/char.data'
|
|
SET enable_seqscan=on;
|
|
SELECT count(*) FROM vchartmp WHERE a < '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
587
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a <= '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
588
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a = '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a >= '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
401
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a > '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
400
|
|
(1 row)
|
|
|
|
SET client_min_messages = DEBUG1;
|
|
CREATE INDEX vcharidx ON vchartmp USING GIST ( text(a) );
|
|
DEBUG: building index "vcharidx" on table "vchartmp" serially
|
|
DEBUG: using sorted GiST build
|
|
CREATE INDEX vcharidx_b ON vchartmp USING GIST ( text(a) ) WITH (buffering=on);
|
|
DEBUG: building index "vcharidx_b" on table "vchartmp" serially
|
|
DROP INDEX vcharidx_b;
|
|
RESET client_min_messages;
|
|
SET enable_seqscan=off;
|
|
SELECT count(*) FROM vchartmp WHERE a < '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
587
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a <= '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
588
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a = '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a >= '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
401
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM vchartmp WHERE a > '31b0'::varchar(32);
|
|
count
|
|
-------
|
|
400
|
|
(1 row)
|
|
|