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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
84 lines
1.8 KiB
Plaintext
84 lines
1.8 KiB
Plaintext
-- varbit check
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CREATE TABLE varbittmp (a varbit);
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\copy varbittmp from 'data/varbit.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM varbittmp WHERE a < '1110100111010';
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count
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-------
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549
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(1 row)
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SELECT count(*) FROM varbittmp WHERE a <= '1110100111010';
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count
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-------
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550
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(1 row)
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SELECT count(*) FROM varbittmp WHERE a = '1110100111010';
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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 varbittmp WHERE a >= '1110100111010';
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count
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-------
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51
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(1 row)
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SELECT count(*) FROM varbittmp WHERE a > '1110100111010';
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count
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-------
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50
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(1 row)
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SET client_min_messages = DEBUG1;
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CREATE INDEX varbitidx ON varbittmp USING GIST ( a );
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DEBUG: building index "varbitidx" on table "varbittmp" serially
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DEBUG: using sorted GiST build
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CREATE INDEX varbitidx_b ON varbittmp USING GIST ( a ) WITH (buffering=on);
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DEBUG: building index "varbitidx_b" on table "varbittmp" serially
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DROP INDEX varbitidx_b;
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RESET client_min_messages;
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SET enable_seqscan=off;
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SELECT count(*) FROM varbittmp WHERE a < '1110100111010'::varbit;
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count
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-------
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549
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(1 row)
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SELECT count(*) FROM varbittmp WHERE a <= '1110100111010'::varbit;
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count
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-------
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550
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(1 row)
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SELECT count(*) FROM varbittmp WHERE a = '1110100111010'::varbit;
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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 varbittmp WHERE a >= '1110100111010'::varbit;
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count
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-------
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51
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(1 row)
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SELECT count(*) FROM varbittmp WHERE a > '1110100111010'::varbit;
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count
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-------
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50
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(1 row)
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-- Test index-only scans
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SET enable_bitmapscan=off;
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EXPLAIN (COSTS OFF)
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SELECT a FROM bittmp WHERE a BETWEEN '1000000' and '1000001';
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QUERY PLAN
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---------------------------------------------------------------------
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Index Only Scan using bitidx on bittmp
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Index Cond: ((a >= '1000000'::"bit") AND (a <= '1000001'::"bit"))
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(2 rows)
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