[HACKERS] btree_gin and ranges

[Teodor Sigaev]

Suggested patch adds GIN support contains operator for ranges over scalar 
column.

It allows more effective GIN scan. Currently, queries like
SELECT * FROM test_int4 WHERE i <= 1 and i >= 1


With patch it's possible to rewrite query with ranges
SELECT * FROM test_int4 WHERE i <@ '[-1, 1]'::int4range
and GIN index will support this query with single scan from -1 to 1.





--
Teodor Sigaev                                   E-mail: teo...@sigaev.ru
                                                   WWW: http://www.sigaev.ru/

will be excuted by GIN with two scans: one is from mines infinity to 1 and another is from -1 to plus infinity. That's because GIN is "generalized" and it doesn't know a semantics of operation. Patch provides index support only for existing range types: int4, int8, numeric, date and timestamp with and without time zone.

btree_gin_range-1.patch.gz
Description: GNU Zip compressed data

-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers