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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/timestamp.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM timestamptmp WHERE a > '2004-10-26 08:55:08';
289
(1 row)
SELECT a, a <-> '2004-10-26 08:55:08' FROM timestamptmp ORDER BY a <-> '2004-10-26 08:55:08' LIMIT 3;
a | ?column?
--------------------------+------------------------------------
Tue Oct 26 08:55:08 2004 | @ 0
Sun Oct 31 06:35:03 2004 | @ 4 days 21 hours 39 mins 55 secs
Mon Nov 29 20:12:43 2004 | @ 34 days 11 hours 17 mins 35 secs
(3 rows)
CREATE INDEX timestampidx ON timestamptmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM timestamptmp WHERE a < '2004-10-26 08:55:08'::timestamp;
@ -64,3 +72,20 @@ SELECT count(*) FROM timestamptmp WHERE a > '2004-10-26 08:55:08'::timestamp;
289
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '2004-10-26 08:55:08' FROM timestamptmp ORDER BY a <-> '2004-10-26 08:55:08' LIMIT 3;
QUERY PLAN
-----------------------------------------------------------------------------------
Limit
-> Index Scan using timestampidx on timestamptmp
Order By: (a <-> 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(3 rows)
SELECT a, a <-> '2004-10-26 08:55:08' FROM timestamptmp ORDER BY a <-> '2004-10-26 08:55:08' LIMIT 3;
a | ?column?
--------------------------+------------------------------------
Tue Oct 26 08:55:08 2004 | @ 0
Sun Oct 31 06:35:03 2004 | @ 4 days 21 hours 39 mins 55 secs
Mon Nov 29 20:12:43 2004 | @ 34 days 11 hours 17 mins 35 secs
(3 rows)