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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
1.1 KiB
SQL
42 lines
1.1 KiB
SQL
-- float8 check
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CREATE TABLE float8tmp (a float8);
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\copy float8tmp from 'data/float8.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM float8tmp WHERE a < -1890.0;
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SELECT count(*) FROM float8tmp WHERE a <= -1890.0;
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SELECT count(*) FROM float8tmp WHERE a = -1890.0;
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SELECT count(*) FROM float8tmp WHERE a >= -1890.0;
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SELECT count(*) FROM float8tmp WHERE a > -1890.0;
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SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
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SET client_min_messages = DEBUG1;
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CREATE INDEX float8idx ON float8tmp USING gist ( a );
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CREATE INDEX float8idx_b ON float8tmp USING gist ( a ) WITH (buffering=on);
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DROP INDEX float8idx_b;
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RESET client_min_messages;
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SET enable_seqscan=off;
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SELECT count(*) FROM float8tmp WHERE a < -1890.0::float8;
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SELECT count(*) FROM float8tmp WHERE a <= -1890.0::float8;
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SELECT count(*) FROM float8tmp WHERE a = -1890.0::float8;
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SELECT count(*) FROM float8tmp WHERE a >= -1890.0::float8;
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SELECT count(*) FROM float8tmp WHERE a > -1890.0::float8;
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EXPLAIN (COSTS OFF)
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SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
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SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
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