Re: Aggregate functions with FROM clause and ROW_COUNT diagnostics

On Mon, May 21, 2018 at 12:54:56PM -0400, Tom Lane wrote:
> Alexey Dokuchaev <danfe@nsu.ru> writes:
> > Quick reality check question: are count(*) vs. count(_) equivalent
> > above?
> 
> Only if _ is guaranteed non-null ... which, as a rowtype result, it
> probably is.  But I'd use count(*) if you're concerned about speed.

Understood.  Yes, my primary concern (after correctness) is speed.  Thank
you all again for very helpful and prompt replies guys.

./danfe