On Mon, Aug 6, 2018 at 12:45 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Ah, gotcha. But whether the behavior is sane or not, it'd be reproducible
> for any specific input dataset on any specific platform (unless you've got
> a quicksort that actually uses randomized pivots; but ours doesn't, and
> I think that pg_dump does use src/port/qsort.c). So that partially
> answers Andrew's question as to why we've not seen instability in the
> buildfarm's results.
I completely missed that the qsort in use was part of libpgport; that
should make it much easier to repro. We'll give it a shot.
Thanks,
--Jacob