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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/int2.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM int2tmp WHERE a > 237;
248
(1 row)
SELECT a, a <-> '237' FROM int2tmp ORDER BY a <-> '237' LIMIT 3;
a | ?column?
-----+----------
237 | 0
232 | 5
228 | 9
(3 rows)
CREATE INDEX int2idx ON int2tmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM int2tmp WHERE a < 237::int2;
@ -64,3 +72,20 @@ SELECT count(*) FROM int2tmp WHERE a > 237::int2;
248
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '237' FROM int2tmp ORDER BY a <-> '237' LIMIT 3;
QUERY PLAN
-------------------------------------------
Limit
-> Index Scan using int2idx on int2tmp
Order By: (a <-> 237::smallint)
(3 rows)
SELECT a, a <-> '237' FROM int2tmp ORDER BY a <-> '237' LIMIT 3;
a | ?column?
-----+----------
237 | 0
232 | 5
228 | 9
(3 rows)