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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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6
contrib/btree_gist/sql/float4.sql
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@ -16,6 +16,8 @@ SELECT count(*) FROM float4tmp WHERE a >= -179.0;
SELECT count(*) FROM float4tmp WHERE a > -179.0;
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
CREATE INDEX float4idx ON float4tmp USING gist ( a );
SET enable_seqscan=off;
@ -29,3 +31,7 @@ SELECT count(*) FROM float4tmp WHERE a = -179.0::float4;
SELECT count(*) FROM float4tmp WHERE a >= -179.0::float4;
SELECT count(*) FROM float4tmp WHERE a > -179.0::float4;
EXPLAIN (COSTS OFF)
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;
SELECT a, a <-> '-179.0' FROM float4tmp ORDER BY a <-> '-179.0' LIMIT 3;