From 8436489c81c23af637696ac69cdaafddcc907ee1 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Wed, 2 Mar 2011 14:43:24 -0500 Subject: Add KNNGIST support to contrib/btree_gist. This extends GiST's support for nearest-neighbor searches to many of the standard data types. Teodor Sigaev --- contrib/btree_gist/sql/float4.sql | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'contrib/btree_gist/sql/float4.sql') diff --git a/contrib/btree_gist/sql/float4.sql b/contrib/btree_gist/sql/float4.sql index fb4b726d223..3da1ce953c8 100644 --- a/contrib/btree_gist/sql/float4.sql +++ b/contrib/btree_gist/sql/float4.sql @@ -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; -- cgit v1.2.3