Re: FETCH FIRST clause PERCENT option

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От Andres Freund
Тема Re: FETCH FIRST clause PERCENT option
Дата
Msg-id 20180821125025.u2c6uzqnca3dmt2i@alap3.anarazel.de
обсуждение исходный текст
Ответ на Re: FETCH FIRST clause PERCENT option  (Surafel Temesgen <surafel3000@gmail.com>)
Ответы Re: FETCH FIRST clause PERCENT option
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On 2018-08-21 15:47:07 +0300, Surafel Temesgen wrote:
> On Thu, Aug 16, 2018 at 5:34 PM, Andres Freund <andres@anarazel.de> wrote:
> 
> >
> > Won't that have rather massive issues with multiple evaluations of
> > clauses in the query?  Besides being really expensive?
> >
> The plan re-scane after first execution I can’t see issue for multiple
> execution of a clause in this case

Imagine volatile functions being used. That can be problematic because
of repeated side-effects, but also will lead to plainly wrong
results. Consider what happens with your approach where somebody does
something like WHERE value < random().

Greetings,

Andres Freund


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