> One more direction could be implementing "MCV" for range of values (group > values and interpolate in between). Consider statistics on timestamp column > that says that for "2008-December" there are as many X rows, for > "2008-November" as many as Y, etc. That could be used for rather accurate > cardinality estimation of "between" cases, while keeping number of entries > in "MCV" list small. >
I suggested this earlier ( http://archives.postgresql.org/pgsql-hackers/2008-06/msg00353.php ). If there's interest, I'd be happy to clean up my patch and submit it for 8.5 -Nathan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
