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https://git.postgresql.org/git/postgresql.git
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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
2.1 KiB
Plaintext
99 lines
2.1 KiB
Plaintext
-- money check
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CREATE TABLE moneytmp (a money);
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\copy moneytmp from 'data/cash.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM moneytmp WHERE a < '22649.64';
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count
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-------
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289
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(1 row)
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SELECT count(*) FROM moneytmp WHERE a <= '22649.64';
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count
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-------
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290
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(1 row)
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SELECT count(*) FROM moneytmp WHERE a = '22649.64';
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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 moneytmp WHERE a >= '22649.64';
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count
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-------
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254
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(1 row)
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SELECT count(*) FROM moneytmp WHERE a > '22649.64';
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count
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-------
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253
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(1 row)
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SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
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a | ?column?
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------------+----------
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$21,472.79 | $0.00
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$21,469.25 | $3.54
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$21,915.01 | $442.22
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(3 rows)
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SET client_min_messages = DEBUG1;
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CREATE INDEX moneyidx ON moneytmp USING gist ( a );
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DEBUG: building index "moneyidx" on table "moneytmp" serially
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DEBUG: using sorted GiST build
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CREATE INDEX moneyidx_b ON moneytmp USING gist ( a ) WITH (buffering=on);
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DEBUG: building index "moneyidx_b" on table "moneytmp" serially
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DROP INDEX moneyidx_b;
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RESET client_min_messages;
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SET enable_seqscan=off;
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SELECT count(*) FROM moneytmp WHERE a < '22649.64'::money;
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count
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-------
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289
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(1 row)
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SELECT count(*) FROM moneytmp WHERE a <= '22649.64'::money;
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count
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-------
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290
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(1 row)
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SELECT count(*) FROM moneytmp WHERE a = '22649.64'::money;
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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 moneytmp WHERE a >= '22649.64'::money;
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count
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-------
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254
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(1 row)
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SELECT count(*) FROM moneytmp WHERE a > '22649.64'::money;
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count
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-------
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253
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(1 row)
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EXPLAIN (COSTS OFF)
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SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' 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 moneyidx on moneytmp
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Order By: (a <-> '$21,472.79'::money)
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(3 rows)
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SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
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a | ?column?
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------------+----------
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$21,472.79 | $0.00
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$21,469.25 | $3.54
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$21,915.01 | $442.22
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(3 rows)
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