postgresql/contrib/btree_gist/expected/int4.out
Heikki Linnakangas 9f984ba6d2 Add sortsupport for gist_btree opclasses, for faster index builds.
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
2021-04-07 13:22:05 +03:00

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-- int4 check
CREATE TABLE int4tmp (a int4);
\copy int4tmp from 'data/int2.data'
SET enable_seqscan=on;
SELECT count(*) FROM int4tmp WHERE a < 237;
count
-------
297
(1 row)
SELECT count(*) FROM int4tmp WHERE a <= 237;
count
-------
298
(1 row)
SELECT count(*) FROM int4tmp WHERE a = 237;
count
-------
1
(1 row)
SELECT count(*) FROM int4tmp WHERE a >= 237;
count
-------
249
(1 row)
SELECT count(*) FROM int4tmp WHERE a > 237;
count
-------
248
(1 row)
SELECT a, a <-> '237' FROM int4tmp ORDER BY a <-> '237' LIMIT 3;
a | ?column?
-----+----------
237 | 0
232 | 5
228 | 9
(3 rows)
SET client_min_messages = DEBUG1;
CREATE INDEX int4idx ON int4tmp USING gist ( a );
DEBUG: building index "int4idx" on table "int4tmp" serially
DEBUG: using sorted GiST build
CREATE INDEX int4idx_b ON int4tmp USING gist ( a ) WITH (buffering=on);
DEBUG: building index "int4idx_b" on table "int4tmp" serially
DROP INDEX int4idx_b;
RESET client_min_messages;
SET enable_seqscan=off;
SELECT count(*) FROM int4tmp WHERE a < 237::int4;
count
-------
297
(1 row)
SELECT count(*) FROM int4tmp WHERE a <= 237::int4;
count
-------
298
(1 row)
SELECT count(*) FROM int4tmp WHERE a = 237::int4;
count
-------
1
(1 row)
SELECT count(*) FROM int4tmp WHERE a >= 237::int4;
count
-------
249
(1 row)
SELECT count(*) FROM int4tmp WHERE a > 237::int4;
count
-------
248
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '237' FROM int4tmp ORDER BY a <-> '237' LIMIT 3;
QUERY PLAN
------------------------------------------------
Limit
-> Index Only Scan using int4idx on int4tmp
Order By: (a <-> 237)
(3 rows)
SELECT a, a <-> '237' FROM int4tmp ORDER BY a <-> '237' LIMIT 3;
a | ?column?
-----+----------
237 | 0
232 | 5
228 | 9
(3 rows)