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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/int8.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM int8tmp WHERE a > 464571291354841;
270
(1 row)
SELECT a, a <-> '464571291354841' FROM int8tmp ORDER BY a <-> '464571291354841' LIMIT 3;
a | ?column?
-----------------+----------------
464571291354841 | 0
457257666629329 | 7313624725512
478227196042750 | 13655904687909
(3 rows)
CREATE INDEX int8idx ON int8tmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM int8tmp WHERE a < 464571291354841::int8;
@ -64,3 +72,20 @@ SELECT count(*) FROM int8tmp WHERE a > 464571291354841::int8;
270
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '464571291354841' FROM int8tmp ORDER BY a <-> '464571291354841' LIMIT 3;
QUERY PLAN
---------------------------------------------------
Limit
-> Index Scan using int8idx on int8tmp
Order By: (a <-> 464571291354841::bigint)
(3 rows)
SELECT a, a <-> '464571291354841' FROM int8tmp ORDER BY a <-> '464571291354841' LIMIT 3;
a | ?column?
-----------------+----------------
464571291354841 | 0
457257666629329 | 7313624725512
478227196042750 | 13655904687909
(3 rows)