Re: PL/pgSQL PERFORM with CTE
От | Pavel Stehule |
---|---|
Тема | Re: PL/pgSQL PERFORM with CTE |
Дата | |
Msg-id | CAFj8pRC2n5wTYn7=1Fz7uNVYpX4pAi3FXV=8yM5SXtxH02gbsg@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: PL/pgSQL PERFORM with CTE ("David E. Wheeler" <david@justatheory.com>) |
Ответы |
Re: PL/pgSQL PERFORM with CTE
Re: PL/pgSQL PERFORM with CTE |
Список | pgsql-hackers |
2013/8/20 David E. Wheeler <david@justatheory.com>
On Aug 20, 2013, at 2:41 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote:I am passing the values returned from a CTE to a call to pg_notify(). I do not care to collect the output of pg_notify(), which returns VOID.
> yes, in this context you should not use a PERFORM
>
> PL/pgSQL protect you before useless queries - so you can use a CTE without returned result directly or CTE with result via PERFORM statement (and in this case it must be unmodifing CTE).
>
> Sorry, I don't see any problem - why you return some from CTE and then you throw this result?
it is little bit different issue - PL/pgSQL doesn't check if returned type is VOID - it can be allowed, I am thinking. So check of empty result can be enhanced.
Regards
Pavel
Best,
David
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