Jaime Casanova <ja...@2ndquadrant.com> writes:
> If i create a DOMAIN an then want to create a CAST from that domain to
> another type it gives an error.

Yes.  See previous discussions about that, e.g. these threads:

http://archives.postgresql.org/pgsql-hackers/2006-05/msg00072.php
http://archives.postgresql.org/pgsql-hackers/2006-09/msg00695.php

It's *not* trivial to fix, at least not in a way that gives desirable
behavior for more than the simplest cases.

                        regards, tom lane

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