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Add KNNGIST support to contrib/btree_gist.

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This extends GiST's support for nearest-neighbor searches to many of the
standard data types.

Teodor Sigaev
This commit is contained in:
Tom Lane
2011-03-02 14:43:24 -05:00
parent 6094c242d1
commit 8436489c81
40 changed files with 1546 additions and 59 deletions
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25
contrib/btree_gist/expected/float8.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM float8tmp WHERE a > -1890.0;
306
(1 row)
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
a | ?column?
--------------+------------
-1890 | 0
-2003.634512 | 113.634512
-1769.73634 | 120.26366
(3 rows)
CREATE INDEX float8idx ON float8tmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM float8tmp WHERE a < -1890.0::float8;
@ -64,3 +72,20 @@ SELECT count(*) FROM float8tmp WHERE a > -1890.0::float8;
306
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
QUERY PLAN
-----------------------------------------------------
Limit
-> Index Scan using float8idx on float8tmp
Order By: (a <-> (-1890)::double precision)
(3 rows)
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
a | ?column?
--------------+------------
-1890 | 0
-2003.634512 | 113.634512
-1769.73634 | 120.26366
(3 rows)