From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: WIP: Upper planner pathification |
Date: | 2016-03-02 23:01:41 |
Message-ID: | 563.1456959701@sss.pgh.pa.us |
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Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> writes:
> Agreed -- we need this in tree as soon as realistically possible.
> There is a a bit a problem here, because this patch conflicts heavily
> with at least one other patch that's been in the queue for a long time,
> which is Kommi/Rowley's patch for parallel aggregation; the more we
> delay applying this one, the worse the deadlines for that one.
> I assume they are hard at work updating that patch to apply on top of
> Tom's patch. It's not realistic to expect that we would apply any
> further planner changes before this one is in.
I don't think it's quite that bad: the patch doesn't touch scan/join
planning very much, so for instance I doubt that the pending unique-joins
patch is completely broken. But yeah, anything having anything to do
with planning of grouping/aggregation or later stages is going to need
major revision to play with this.
regards, tom lane
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