postgresql/contrib/btree_gist/expected/float4.out
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

92 lines
1.7 KiB
Plaintext

-- 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;
count
-------
244
(1 row)
SELECT count(*) FROM float4tmp WHERE a <= -179.0;
count
-------
245
(1 row)
SELECT count(*) FROM float4tmp WHERE a = -179.0;
count
-------
1
(1 row)
SELECT count(*) FROM float4tmp WHERE a >= -179.0;
count
-------
303
(1 row)
SELECT count(*) FROM float4tmp WHERE a > -179.0;
count
-------
302
(1 row)
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
a | ?column?
----------+----------
-179 | 0
-189.024 | 10.0239
-158.177 | 20.8226
(3 rows)
CREATE INDEX float4idx ON float4tmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM float4tmp WHERE a < -179.0::float4;
count
-------
244
(1 row)
SELECT count(*) FROM float4tmp WHERE a <= -179.0::float4;
count
-------
245
(1 row)
SELECT count(*) FROM float4tmp WHERE a = -179.0::float4;
count
-------
1
(1 row)
SELECT count(*) FROM float4tmp WHERE a >= -179.0::float4;
count
-------
303
(1 row)
SELECT count(*) FROM float4tmp WHERE a > -179.0::float4;
count
-------
302
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
QUERY PLAN
-----------------------------------------------
Limit
-> Index Scan using float4idx on float4tmp
Order By: (a <-> (-179)::real)
(3 rows)
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
a | ?column?
----------+----------
-179 | 0
-189.024 | 10.0239
-158.177 | 20.8226
(3 rows)