Robert Haas <robertmh...@gmail.com> writes: > On Mon, Mar 26, 2018 at 4:27 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: >> I fear that what will happen, if we commit this, is that something like >> 0.01% of the users of array_agg and string_agg will be pleased, another >> maybe 20% will be unaffected because they wrote ORDER BY which prevents >> parallel aggregation, and the remaining 80% will scream because we broke >> their queries. Telling them they should've written ORDER BY isn't going >> to cut it, IMO, when the benefit of that breakage will accrue only to some >> very tiny fraction of use-cases.
> I think your estimated percentages here are wildly inaccurate. My estimate for the number of people positively impacted could be off by a factor of a thousand, and it still wouldn't change the conclusion that this will hurt more people than it helps. I see that I'm in the minority on this, so I'm prepared to accept defeat, but I stand by that conclusion. regards, tom lane