On Mon, Nov 30, 2015 at 11:00 PM, David Rowley <david.row...@2ndquadrant.com> wrote: > There are in fact also two queries in TPC-H (Q10 and Q18) which are written > to include all of the non-aggregated column in the GROUP BY list. During a > recent test I witnessed a 50% gain in performance in Q10 by removing the > unneeded columns from the GROUP BY clause.
Wow, that's pretty impressive. +1 for trying to do something about this. (Full disclosure: I have not read your patch.) -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
