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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/timestamptz.out
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@@ -92,6 +92,14 @@ SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+4';
157
(1 row)
SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
a | ?column?
------------------------------+-----------------------------------
Tue Dec 18 05:59:54 2018 PST | @ 1 hour
Thu Jan 10 03:01:34 2019 PST | @ 22 days 22 hours 1 min 40 secs
Thu Jan 24 12:28:12 2019 PST | @ 37 days 7 hours 28 mins 18 secs
(3 rows)
CREATE INDEX timestamptzidx ON timestamptztmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+3'::timestamptz;
@@ -184,3 +192,20 @@ SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+4'::time
157
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
QUERY PLAN
------------------------------------------------------------------------------------
Limit
-> Index Scan using timestamptzidx on timestamptztmp
Order By: (a <-> 'Tue Dec 18 04:59:54 2018 PST'::timestamp with time zone)
(3 rows)
SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
a | ?column?
------------------------------+-----------------------------------
Tue Dec 18 05:59:54 2018 PST | @ 1 hour
Thu Jan 10 03:01:34 2019 PST | @ 22 days 22 hours 1 min 40 secs
Thu Jan 24 12:28:12 2019 PST | @ 37 days 7 hours 28 mins 18 secs
(3 rows)