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?
--
Thomas Munro
http://www.enterprisedb.com