| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Richard Guo <riguo(at)pivotal(dot)io>, "Li, Zheng" <zhelli(at)amazon(dot)com>, "Finnerty, Jim" <jfinnert(at)amazon(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: NOT IN subquery optimization |
| Date: | 2019-03-01 22:57:58 |
| Message-ID: | 1674.1551481078@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> writes:
> On Sat, 2 Mar 2019 at 05:44, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> I'm not sure if the second one is actually a semantics bug or just a
>> misoptimization? But yeah, +1 for putting in some simple tests for
>> corner cases right now. Anyone want to propose a specific patch?
> The second is just reducing the planner's flexibility to produce a
> good plan. The first is a bug. Proposed regression test attached.
LGTM, pushed.
regards, tom lane
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