Re: PoC: Partial sort

From: Alexander Korotkov <aekorotkov(at)gmail(dot)com>
To: Peter Geoghegan <pg(at)heroku(dot)com>
Cc: Andreas Karlsson <andreas(at)proxel(dot)se>, David Rowley <dgrowleyml(at)gmail(dot)com>, Marti Raudsepp <marti(at)juffo(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Andres Freund <andres(at)2ndquadrant(dot)com>, Martijn van Oosterhout <kleptog(at)svana(dot)org>
Subject: Re: PoC: Partial sort
Date: 2015-10-20 11:17:26
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On Fri, Oct 16, 2015 at 7:11 PM, Alexander Korotkov <aekorotkov(at)gmail(dot)com>

> On Sun, Jun 7, 2015 at 11:01 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
>> On Sun, Jun 7, 2015 at 8:10 AM, Andreas Karlsson <andreas(at)proxel(dot)se>
>> wrote:
>> > Are you planning to work on this patch for 9.6?
>> FWIW I hope so. It's a nice patch.
> I'm trying to to whisk dust. Rebased version of patch is attached. This
> patch isn't passing regression tests because of plan changes. I'm not yet
> sure about those changes: why they happens and are they really regression?
> Since I'm not very familiar with planning of INSERT ON CONFLICT and RLS,
> any help is appreciated.

Planner regression is fixed in the attached version of patch. It appears
that get_cheapest_fractional_path_for_pathkeys() behaved wrong when no
ordering is required.

Alexander Korotkov
Postgres Professional:
The Russian Postgres Company

Attachment Content-Type Size
partial-sort-basic-4.patch application/octet-stream 74.3 KB

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