Horton

Re: Early WIP/PoC for inlining CTEs

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Andreas Karlsson <andreas@proxel.se>, Andres Freund <andres@anarazel.de>, Thomas Munro <thomas.munro@enterprisedb.com>, Andrew Gierth <andrew@tao11.riddles.org.uk>, David Fetter <david@fetter.org>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-01-28T22:05:32Z
Lists: pgsql-hackers

Commits

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  1. Prevent inlining of multiply-referenced CTEs with outer recursive refs.

  2. Allow user control of CTE materialization, and change the default behavior.

  3. Split QTW_EXAMINE_RTES flag into QTW_EXAMINE_RTES_BEFORE/_AFTER.

  4. document when PREPARE uses generic plans

Peter Eisentraut <peter.eisentraut@2ndquadrant.com> writes:
> On 28/01/2019 21:35, Tom Lane wrote:
>> Conceivably we could make it work without the parens:
>> ...

> Or put it at the end?
>     WITH ctename AS ( query ) MATERIALIZED

Yeah, I thought about that too, but it doesn't seem like an improvement.
If the query is very long (which isn't unlikely) I think people would
prefer to see the option(s) up front.

			regards, tom lane