Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> My idea is implement inherits clause for CREATE TYPE command.
-1. We have enough problems dealing with alterations of inherited
rowtypes already. As long as inheritance is restricted to tables,
we can use table locking to help prevent problems --- but there's
no provision for locking free-standing types. And introducing
locking on types would cost way more than this seems likely to be
worth.
regards, tom lane