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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/cash.out
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@ -32,6 +32,14 @@ SELECT count(*) FROM moneytmp WHERE a > '22649.64';
253
(1 row)
SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
a | ?column?
------------+----------
$21,472.79 | $0.00
$21,469.25 | $3.54
$21,915.01 | $442.22
(3 rows)
CREATE INDEX moneyidx ON moneytmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM moneytmp WHERE a < '22649.64'::money;
@ -64,3 +72,20 @@ SELECT count(*) FROM moneytmp WHERE a > '22649.64'::money;
253
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
QUERY PLAN
-----------------------------------------------
Limit
-> Index Scan using moneyidx on moneytmp
Order By: (a <-> '$21,472.79'::money)
(3 rows)
SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
a | ?column?
------------+----------
$21,472.79 | $0.00
$21,469.25 | $3.54
$21,915.01 | $442.22
(3 rows)