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From: David Fetter <david@fetter.org>
To: Andreas Karlsson <andreas@proxel.se>
Cc: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: Andrew Gierth <andrew@tao11.riddles.org.uk>
Cc: Pg Hackers <pgsql-hackers@postgresql.org>
Subject: Re: Early WIP/PoC for inlining CTEs
Date: Thu, 4 Oct 2018 20:49:53 +0200
Message-ID: <20181004184952.GO25294@fetter.org> (raw)
In-Reply-To: <5bad579d-7a99-74de-2311-b4f049da8b40@proxel.se>
References: <87sh48ffhb.fsf@news-spur.riddles.org.uk>
	<20180725054236.GB17411@fetter.org>
	<87bmavfjhy.fsf@news-spur.riddles.org.uk>
	<20180725191447.GE17411@fetter.org>
	<CAEepm=0MKV3MnR4Dn5RkXsK+RnmHEFitqiG4PcBhXtBK4JOoWw@mail.gmail.com>
	<20180727081058.GN17411@fetter.org>
	<dccb37dd-2f52-dbd7-a4c4-72a5853f4838@proxel.se>
	<e02af96a-3e25-5de4-09a4-a7ebf3452184@proxel.se>
	<20181003155720.GG25294@fetter.org>
	<5bad579d-7a99-74de-2311-b4f049da8b40@proxel.se>

On Thu, Oct 04, 2018 at 11:22:32AM +0200, Andreas Karlsson wrote:
> On 10/03/2018 05:57 PM, David Fetter wrote:
> >Is there any meaningful distinction between "inlining," by which I
> >mean converting to a subquery, and predicate pushdown, which
> >would happen at least for a first cut, at the rewrite stage?
> 
> Sorry, but I do not think I understand your question. The ability to push
> down predicates is just one of the potential benefits from inlining.

Oracle appears to have such a distinction, and it appears we don't.
https://medium.com/@hakibenita/be-careful-with-cte-in-postgresql-fca5e24d2119

Best,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778

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