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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/time.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM timetmp WHERE a > '10:57:11';
292
(1 row)
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
a | ?column?
----------+-----------------
10:57:11 | @ 0
10:57:10 | @ 1 sec
10:55:32 | @ 1 min 39 secs
(3 rows)
CREATE INDEX timeidx ON timetmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM timetmp WHERE a < '10:57:11'::time;
@ -64,3 +72,20 @@ SELECT count(*) FROM timetmp WHERE a > '10:57:11'::time;
292
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
QUERY PLAN
--------------------------------------------------------------
Limit
-> Index Scan using timeidx on timetmp
Order By: (a <-> '10:57:11'::time without time zone)
(3 rows)
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
a | ?column?
----------+-----------------
10:57:11 | @ 0
10:57:10 | @ 1 sec
10:55:32 | @ 1 min 39 secs
(3 rows)