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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
99 lines
2.2 KiB
Plaintext
99 lines
2.2 KiB
Plaintext
-- int8 check
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CREATE TABLE int8tmp (a int8);
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\copy int8tmp from 'data/int8.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM int8tmp WHERE a < 464571291354841;
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count
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-------
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276
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(1 row)
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SELECT count(*) FROM int8tmp WHERE a <= 464571291354841;
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count
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-------
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277
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(1 row)
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SELECT count(*) FROM int8tmp WHERE a = 464571291354841;
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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 int8tmp WHERE a >= 464571291354841;
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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 int8tmp WHERE a > 464571291354841;
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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 <-> '464571291354841' FROM int8tmp ORDER BY a <-> '464571291354841' LIMIT 3;
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a | ?column?
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-----------------+----------------
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464571291354841 | 0
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457257666629329 | 7313624725512
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478227196042750 | 13655904687909
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(3 rows)
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SET client_min_messages = DEBUG1;
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CREATE INDEX int8idx ON int8tmp USING gist ( a );
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DEBUG: building index "int8idx" on table "int8tmp" serially
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DEBUG: using sorted GiST build
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CREATE INDEX int8idx_b ON int8tmp USING gist ( a ) WITH (buffering=on);
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DEBUG: building index "int8idx_b" on table "int8tmp" serially
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DROP INDEX int8idx_b;
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RESET client_min_messages;
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SET enable_seqscan=off;
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SELECT count(*) FROM int8tmp WHERE a < 464571291354841::int8;
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count
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-------
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276
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(1 row)
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SELECT count(*) FROM int8tmp WHERE a <= 464571291354841::int8;
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count
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-------
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277
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(1 row)
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SELECT count(*) FROM int8tmp WHERE a = 464571291354841::int8;
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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 int8tmp WHERE a >= 464571291354841::int8;
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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 int8tmp WHERE a > 464571291354841::int8;
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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 <-> '464571291354841' FROM int8tmp ORDER BY a <-> '464571291354841' 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 int8idx on int8tmp
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Order By: (a <-> '464571291354841'::bigint)
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(3 rows)
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SELECT a, a <-> '464571291354841' FROM int8tmp ORDER BY a <-> '464571291354841' LIMIT 3;
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a | ?column?
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-----------------+----------------
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464571291354841 | 0
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457257666629329 | 7313624725512
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478227196042750 | 13655904687909
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(3 rows)
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