Re: COALESCE and NULLIF semantics

Jeff Davis <pgsql@j-davis.com> writes:
> To make that interpretation work I think you would need to say that
> ROW(NULL,NULL) _is_ the null value,

Right...

> and you would have to allow things like:

>   select 1 + row(null,null);

Eh?  It's a null value of a composite type.  The above is a type
violation.
        regards, tom lane