From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
Cc: | David Rowley <dgrowley(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Dilip kumar <dilip(dot)kumar(at)huawei(dot)com> |
Subject: | Re: Allowing join removals for more join types |
Date: | 2014-07-16 01:17:50 |
Message-ID: | 6878.1405473470@sss.pgh.pa.us |
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David Rowley <dgrowleyml(at)gmail(dot)com> writes:
> I've attached an updated patch which puts in some fast path code for
> subquery type joins. I'm really not too sure on a good name for this
> function. I've ended up with query_supports_distinctness() which I'm not
> that keen on, but I didn't manage to come up with anything better.
I've committed this with some mostly but not entirely cosmetic changes.
Notably, I felt that pathnode.c was a pretty questionable place to be
exporting distinctness-proof logic from, and after some reflection decided
to move those functions to analyzejoins.c; that's certainly a better place
for them than pathnode.c, and I don't see any superior third alternative.
regards, tom lane
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