Re: [HACKERS] WIP: Aggregation push-down

From: Antonin Houska <ah(at)cybertec(dot)at>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Richard Guo <riguo(at)pivotal(dot)io>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(at)paquier(dot)xyz>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] WIP: Aggregation push-down
Date: 2019-09-05 06:10:58
Message-ID: 7087.1567663858@localhost
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Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:

> This stuff seems very useful. How come it sits unreviewed for so long?

I think the review is hard for people who are not interested in the planner
very much. And as for further development, there are a few design decisions
that can hardly be resolved without Tom Lane's comments. Right now I recall
two problems: 1) is the way I currently store RelOptInfo for the grouped
relations correct?, 2) how should we handle types for which logical equality
does not imply physical (byte-wise) equality?

Fortunately it seems now that I'm not the only one who cares about 2), so this
problem might be resolved soon:

But 1) still remains.

Antonin Houska

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