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