postgresql/contrib/btree_gist/sql/float4.sql
Tom Lane 8436489c81 Add KNNGIST support to contrib/btree_gist.
This extends GiST's support for nearest-neighbor searches to many of the
standard data types.

Teodor Sigaev
2011-03-02 14:44:33 -05:00

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;