postgres/contrib/btree_gist/sql/float8.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;

SET client_min_messages = DEBUG1;
CREATE INDEX float8idx ON float8tmp USING gist ( a );
CREATE INDEX float8idx_b ON float8tmp USING gist ( a ) WITH (buffering=on);
DROP INDEX float8idx_b;
RESET client_min_messages;

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;