On Tue, Apr 22, 2014 at 10:28 AM, Heikki Linnakangas <hlinnakangas@xxxxxxxxxx> wrote: > On 04/20/2014 07:46 AM, Oleg Bartunov wrote: >> >> btw, 9.4 should be wiser in case of rare+common terms, thanks to GIN >> fast scan feature. > > > Indeed, although we didn't actually do anything to the planner to make it > understand when fast scan helps. Doing something about cost estimation is > still on the 9.4 Open Items list, but I don't have any ideas on what to do > about it, and I haven't heard anything from Alexander about that either. > That means that the cost estimation issue Laurence saw is going to be even > worse in 9.4, because GIN is going to be faster than a seq scan in more > cases than before and the planner doesn't know about it. > > - Heikki You are right, we should return to that topic. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
