Re: [HACKERS] CTE inlining

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От Pavel Stehule
Тема Re: [HACKERS] CTE inlining
Дата
Msg-id CAFj8pRDS4PoM2inJ9V981OxgD+0h3kg5vrAm5EW7V7SoKt_g_g@mail.gmail.com
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Ответ на Re: [HACKERS] CTE inlining  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: [HACKERS] CTE inlining
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2017-04-30 6:28 GMT+02:00 Tom Lane <tgl@sss.pgh.pa.us>:
Craig Ringer <craig.ringer@2ndquadrant.com> writes:
> - as you noted, it is hard to decide when it's worth inlining vs
> materializing for CTE terms referenced more than once.

[ raised eyebrow... ]  Please explain why the answer isn't trivially
"never".

There's already a pretty large hill to climb here in the way of
breaking peoples' expectations about CTEs being optimization
fences.  Breaking the documented semantics about CTEs being
single-evaluation seems to me to be an absolute non-starter.


why we cannot to introduce GUC option - enable_cteoptfence ?

Regards

Pavel

 
                        regards, tom lane


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