Re: PL/pgSQL PERFORM with CTE

On Fri, Aug 23, 2013 at 1:38 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote:
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> 2013/8/23 Merlin Moncure <mmoncure@gmail.com>
> I think so is not good if some programming language functionality does one
> in one context (functions) and does something else in second context
> (procedures).

It's not really different -- it means 'return if able'.  Also there
are a lot of things that would have to be different for other reasons
especially transaction management.  It's not reasonable to expect same
behavior in function vs procedure context -- especially in terms of
sending output to the caller.

> On second hand, I am thinking so requirement PERFORM is good. A query that
> does some, but result is ignored, is strange (and it can be a performance
> fault), so we should not be too friendly in this use case.

Completely disagree.  There are many cases where this is *not*
strange. For example:
SELECT writing_func(some_col) FROM foo;

merlin