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: Andres Freund <andres@anarazel.de>
Cc: Jeremy Finzel <finzelj@gmail.com>, Andrew Gierth <andrew@tao11.riddles.org.uk>, pgsql-hackers@postgresql.org
Date: 2018-07-24T23:57:49Z
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

Andres Freund <andres@anarazel.de> writes:
> On 2018-07-24 19:49:19 -0400, Tom Lane wrote:
>> However, a singly-referenced SELECT CTE could reasonably be treated as
>> equivalent to a sub-select-in-FROM, and then you would have the same
>> mechanisms for preventing inlining as you do for those cases,
>> e.g. OFFSET 0.  And sticking in OFFSET 0 would be backwards-compatible
>> too: your code would still work the same in older releases, unlike if
>> we invent new syntax for this.

> I still think this is just doubling down on prior mistakes.

Not following what you think a better alternative is?  I'd be the
first to agree that OFFSET 0 is a hack, but people are used to it.

Assuming that we go for inline-by-default for at least some cases,
there's a separate discussion to be had about whether it's worth
making a planner-control GUC to force the old behavior.  I'm not
very excited about that, but I bet some people will be.

			regards, tom lane