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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
215 lines
3.5 KiB
Plaintext
215 lines
3.5 KiB
Plaintext
-- numeric check
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CREATE TABLE numerictmp (a numeric);
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\copy numerictmp from 'data/int8.data'
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\copy numerictmp from 'data/numeric.data'
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\copy numerictmp from 'data/float8.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM numerictmp WHERE a < -1890.0;
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count
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-------
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505
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a <= -1890.0;
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count
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-------
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506
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a = -1890.0;
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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 numerictmp WHERE a >= -1890.0;
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count
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-------
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597
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a > -1890.0;
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count
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-------
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596
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a < 'NaN' ;
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count
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-------
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1100
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a <= 'NaN' ;
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count
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-------
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1102
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a = 'NaN' ;
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count
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-------
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2
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a >= 'NaN' ;
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count
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-------
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2
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a > 'NaN' ;
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count
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-------
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0
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a < 0 ;
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count
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-------
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523
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a <= 0 ;
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count
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-------
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526
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a = 0 ;
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count
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-------
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3
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a >= 0 ;
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count
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-------
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579
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a > 0 ;
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count
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-------
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576
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(1 row)
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SET client_min_messages = DEBUG1;
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CREATE INDEX numericidx ON numerictmp USING gist ( a );
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DEBUG: building index "numericidx" on table "numerictmp" serially
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DEBUG: using sorted GiST build
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CREATE INDEX numericidx_b ON numerictmp USING gist ( a ) WITH (buffering=on);
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DEBUG: building index "numericidx_b" on table "numerictmp" serially
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DROP INDEX numericidx_b;
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RESET client_min_messages;
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SET enable_seqscan=off;
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SELECT count(*) FROM numerictmp WHERE a < -1890.0;
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count
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-------
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505
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a <= -1890.0;
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count
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-------
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506
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a = -1890.0;
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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 numerictmp WHERE a >= -1890.0;
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count
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-------
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597
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a > -1890.0;
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count
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-------
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596
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a < 'NaN' ;
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count
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-------
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1100
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a <= 'NaN' ;
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count
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-------
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1102
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a = 'NaN' ;
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count
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-------
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2
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a >= 'NaN' ;
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count
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-------
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2
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a > 'NaN' ;
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count
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-------
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0
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a < 0 ;
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count
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-------
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523
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a <= 0 ;
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count
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-------
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526
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a = 0 ;
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count
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-------
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3
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a >= 0 ;
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count
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-------
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579
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(1 row)
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SELECT count(*) FROM numerictmp WHERE a > 0 ;
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count
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-------
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576
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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 * FROM numerictmp WHERE a BETWEEN 1 AND 300 ORDER BY a;
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QUERY PLAN
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---------------------------------------------------------------------
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Sort
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Sort Key: a
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-> Index Only Scan using numericidx on numerictmp
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Index Cond: ((a >= '1'::numeric) AND (a <= '300'::numeric))
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(4 rows)
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SELECT * FROM numerictmp WHERE a BETWEEN 1 AND 300 ORDER BY a;
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a
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------------
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204.035430
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207.400532
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(2 rows)
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