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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
117 lines
3.7 KiB
Plaintext
117 lines
3.7 KiB
Plaintext
-- interval check
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CREATE TABLE intervaltmp (a interval);
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\copy intervaltmp from 'data/interval.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM intervaltmp WHERE a < '199 days 21:21:23';
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count
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-------
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329
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a <= '199 days 21:21:23';
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count
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-------
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330
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a = '199 days 21:21:23';
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a >= '199 days 21:21:23';
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count
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-------
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271
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a > '199 days 21:21:23';
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count
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-------
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270
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(1 row)
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SELECT a, a <-> '199 days 21:21:23' FROM intervaltmp ORDER BY a <-> '199 days 21:21:23' LIMIT 3;
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a | ?column?
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-------------------------------------+--------------------------------------
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@ 199 days 21 hours 21 mins 23 secs | @ 0
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@ 183 days 6 hours 52 mins 48 secs | @ 16 days 14 hours 28 mins 35 secs
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@ 220 days 19 hours 5 mins 42 secs | @ 21 days -2 hours -15 mins -41 secs
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(3 rows)
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SET client_min_messages = DEBUG1;
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CREATE INDEX intervalidx ON intervaltmp USING gist ( a );
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DEBUG: building index "intervalidx" on table "intervaltmp" serially
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DEBUG: using sorted GiST build
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CREATE INDEX intervalidx_b ON intervaltmp USING gist ( a ) WITH (buffering=on);
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DEBUG: building index "intervalidx_b" on table "intervaltmp" serially
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DROP INDEX intervalidx_b;
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RESET client_min_messages;
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SET enable_seqscan=off;
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SELECT count(*) FROM intervaltmp WHERE a < '199 days 21:21:23'::interval;
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count
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-------
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329
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a <= '199 days 21:21:23'::interval;
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count
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-------
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330
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a = '199 days 21:21:23'::interval;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a >= '199 days 21:21:23'::interval;
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count
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-------
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271
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(1 row)
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SELECT count(*) FROM intervaltmp WHERE a > '199 days 21:21:23'::interval;
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count
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-------
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270
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(1 row)
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EXPLAIN (COSTS OFF)
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SELECT a, a <-> '199 days 21:21:23' FROM intervaltmp ORDER BY a <-> '199 days 21:21:23' LIMIT 3;
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QUERY PLAN
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---------------------------------------------------------------------------
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Limit
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-> Index Only Scan using intervalidx on intervaltmp
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Order By: (a <-> '@ 199 days 21 hours 21 mins 23 secs'::interval)
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(3 rows)
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SELECT a, a <-> '199 days 21:21:23' FROM intervaltmp ORDER BY a <-> '199 days 21:21:23' LIMIT 3;
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a | ?column?
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-------------------------------------+--------------------------------------
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@ 199 days 21 hours 21 mins 23 secs | @ 0
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@ 183 days 6 hours 52 mins 48 secs | @ 16 days 14 hours 28 mins 35 secs
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@ 220 days 19 hours 5 mins 42 secs | @ 21 days -2 hours -15 mins -41 secs
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(3 rows)
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SET enable_indexonlyscan=off;
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EXPLAIN (COSTS OFF)
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SELECT a, a <-> '199 days 21:21:23' FROM intervaltmp ORDER BY a <-> '199 days 21:21:23' LIMIT 3;
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QUERY PLAN
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---------------------------------------------------------------------------
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Limit
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-> Index Scan using intervalidx on intervaltmp
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Order By: (a <-> '@ 199 days 21 hours 21 mins 23 secs'::interval)
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(3 rows)
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SELECT a, a <-> '199 days 21:21:23' FROM intervaltmp ORDER BY a <-> '199 days 21:21:23' LIMIT 3;
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a | ?column?
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-------------------------------------+--------------------------------------
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@ 199 days 21 hours 21 mins 23 secs | @ 0
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@ 183 days 6 hours 52 mins 48 secs | @ 16 days 14 hours 28 mins 35 secs
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@ 220 days 19 hours 5 mins 42 secs | @ 21 days -2 hours -15 mins -41 secs
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(3 rows)
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