On 10/20/2015 01:17 PM, Alexander Korotkov wrote:
On Fri, Oct 16, 2015 at 7:11 PM, Alexander Korotkov
<aekorot...@gmail.com <mailto:aekorot...@gmail.com>> wrote:

    On Sun, Jun 7, 2015 at 11:01 PM, Peter Geoghegan <p...@heroku.com
    <mailto:p...@heroku.com>> wrote:

        On Sun, Jun 7, 2015 at 8:10 AM, Andreas Karlsson
        <andr...@proxel.se <mailto:andr...@proxel.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, are you working on this patch? I'd like to look at the patch, but the last available version (v4) no longer applies - there's plenty of bitrot. Do you plan to send an updated / rebased version?

The main thing I'm particularly interested in is how much is this coupled with the Sort node, and whether it's possible to feed partially sorted tuples into other nodes.

I'm particularly thinking about Hash Aggregate, because the partial sort allows to keep only the "current group" in a hash table, making it much more memory efficient / faster. What do you think?


Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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