mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-21 08:29:39 +08:00
8436489c81
This extends GiST's support for nearest-neighbor searches to many of the standard data types. Teodor Sigaev
38 lines
1004 B
SQL
38 lines
1004 B
SQL
-- float8 check
|
|
|
|
CREATE TABLE float8tmp (a float8);
|
|
|
|
\copy float8tmp from 'data/float8.data'
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a < -1890.0;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a <= -1890.0;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a = -1890.0;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a >= -1890.0;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a > -1890.0;
|
|
|
|
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
|
|
|
|
CREATE INDEX float8idx ON float8tmp USING gist ( a );
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a < -1890.0::float8;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a <= -1890.0::float8;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a = -1890.0::float8;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a >= -1890.0::float8;
|
|
|
|
SELECT count(*) FROM float8tmp WHERE a > -1890.0::float8;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
|
|
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
|