On Fri, Feb 20, 2015 at 1:33 PM, Tomas Vondra
<tomas.vondra@2ndquadrant.com> wrote:
> For example with the same percentile_disc() test as in the other thread:
>
> create table stuff as select random()::numeric as randnum
> from generate_series(1,1000000);
>
> analyze stuff;
>
> select percentile_disc(0) within group (order by randnum) from stuff;
>
>
> I get pretty much no difference in runtimes (not even for the smallest
> dataset, where the Datum patch speedup was significant).
>
> What am I doing wrong?
So you're testing both the patches (numeric + datum tuplesort) at the same time?
I can't think why this would make any difference. Did you forget to
initdb, so that the numeric sortsupport routine was used?
--
Peter Geoghegan