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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/date.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM datetmp WHERE a > '2001-02-13';
313
(1 row)
SELECT a, a <-> '2001-02-13' FROM datetmp ORDER BY a <-> '2001-02-13' LIMIT 3;
a | ?column?
------------+----------
02-13-2001 | 0
02-11-2001 | 2
03-24-2001 | 39
(3 rows)
CREATE INDEX dateidx ON datetmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM datetmp WHERE a < '2001-02-13'::date;
@ -64,3 +72,20 @@ SELECT count(*) FROM datetmp WHERE a > '2001-02-13'::date;
313
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '2001-02-13' FROM datetmp ORDER BY a <-> '2001-02-13' LIMIT 3;
QUERY PLAN
----------------------------------------------
Limit
-> Index Scan using dateidx on datetmp
Order By: (a <-> '02-13-2001'::date)
(3 rows)
SELECT a, a <-> '2001-02-13' FROM datetmp ORDER BY a <-> '2001-02-13' LIMIT 3;
a | ?column?
------------+----------
02-13-2001 | 0
02-11-2001 | 2
03-24-2001 | 39
(3 rows)