On Thu, Feb 25, 2016 at 12:50:06PM +1300, Thomas Munro wrote: > On Thu, Feb 25, 2016 at 12:26 PM, Bruce Momjian <br...@momjian.us> wrote: > > On Thu, Feb 25, 2016 at 10:06:34AM +1100, James Sewell wrote: > >> Now when I run the following SQL (multiple times to allow for getting > >> everything into shared buffers, which is 4GB on my machine): > >> > >> > >> select sum(count_n) from base group by view_time_day; > >> > >> > >> I get the following results: > >> > >> > >> PSQL 9.5 - ~21 seconds > >> PSQL 9.6 devel - ~8.5 seconds > >> > >> > >> I think that's pretty good! > >> > >> I know this is a devel release, things may change, blah blah. But still, > >> something has changed for the better here! > > > > Wow, that is cool. Can anyone suggest which commit improved this? > > Since it sums numerics, maybe integer transition functions from commit > 959277a4f579da5243968c750069570a58e92b38 helped?
Seems it was a wrong report, but anyway, this commit was in 9.5, while the user reported a speedup in 9.6. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + As you are, so once was I. As I am, so you will be. + + Roman grave inscription + -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers