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
988 B
SQL
38 lines
988 B
SQL
-- float4 check
|
|
|
|
CREATE TABLE float4tmp (a float4);
|
|
|
|
\copy float4tmp from 'data/float4.data'
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a < -179.0;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a <= -179.0;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a = -179.0;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a >= -179.0;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a > -179.0;
|
|
|
|
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
|
|
|
|
CREATE INDEX float4idx ON float4tmp USING gist ( a );
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a < -179.0::float4;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a <= -179.0::float4;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a = -179.0::float4;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a >= -179.0::float4;
|
|
|
|
SELECT count(*) FROM float4tmp WHERE a > -179.0::float4;
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
|
|
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
|