Re: Patch: Add parse_type Function - Mailing list pgsql-hackers

I wrote:
> It strikes me that this is basically to_regtype() with the additional
> option to return the typmod.  That leads to some questions:

BTW, another way that this problem could be approached is to use
to_regtype() as-is, with a separate function to obtain the typmod:

select format_type(to_regtype('timestamp(4)'), to_regtypmod('timestamp(4)'));

This is intellectually ugly, since it implies parsing the same
typename string twice.  But on the other hand it avoids the notational
pain and runtime overhead involved in using a record-returning
function.  So I think it might be roughly a wash for performance.
Question to think about is which way is easier to use.  I don't
have an opinion particularly; just throwing the idea out there.

                        regards, tom lane