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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2011-03-02 14:43:24 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2011-03-02 14:44:33 -0500 |
| commit | 8436489c81c23af637696ac69cdaafddcc907ee1 (patch) | |
| tree | f9aabf47bbe6dba2f132dc472f855b306c2fe30c /contrib/btree_gist/sql/float4.sql | |
| parent | 6094c242d1ee40a08f3138811425d7540e8269e4 (diff) | |
| download | postgresql-8436489c81c23af637696ac69cdaafddcc907ee1.tar.gz postgresql-8436489c81c23af637696ac69cdaafddcc907ee1.zip | |
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
Diffstat (limited to 'contrib/btree_gist/sql/float4.sql')
| -rw-r--r-- | contrib/btree_gist/sql/float4.sql | 6 |
1 files changed, 6 insertions, 0 deletions
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; |