Re: a little doubr about domains and pl/python

"Walter Cruz" <walter.php@gmail.com> writes:
> CREATE CAST (integer AS romano) WITH FUNCTION to_roman(integer);

> What's wrong?

Domains aren't supported as cast source/targets at the moment; I don't
think the system is finding your cast specification at all, but is
instead doing this as 5::text::romano which of course fails.  See past
discussions about the subtleties of trying to fix this.
        regards, tom lane