On 2017-03-29 00:17:02 +0300, Alexander Korotkov wrote: > On Tue, Mar 28, 2017 at 5:27 PM, David Steele <da...@pgmasters.net> wrote: > > > Hi Alexander, > > > > On 3/20/17 10:19 AM, Heikki Linnakangas wrote: > > > >> On 03/20/2017 11:33 AM, Alexander Korotkov wrote: > >> > >>> Please, find rebased patch in the attachment. > >>> > >> > >> I had a quick look at this. > >> > > > > <...> > > > > According to 'perf', 85% of the CPU time is spent in ExecCopySlot(). To > >> alleviate that, it might be worthwhile to add a special case for when > >> the group contains exactly one group, and not put the tuple to the > >> tuplesort in that case. Or if we cannot ensure that the Incremental Sort > >> is actually faster, the cost model should probably be smarter, to avoid > >> picking an incremental sort when it's not a win. > >> > > > > This thread has been idle for over a week. Please respond with a new > > patch by 2017-03-30 00:00 AoE (UTC-12) or this submission will be marked > > "Returned with Feedback".
> Thank you for reminder! I've just done so. Please resubmit once updated, it's a cool feature. - Andres -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers