On Thu, Feb 25, 2016 at 12:50:06PM +1300, Thomas Munro wrote:
> On Thu, Feb 25, 2016 at 12:26 PM, Bruce Momjian <bruce@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 <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
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