"Christopher Kings-Lynne" <chriskl@familyhealth.com.au> writes:
> Here, we've just dropped the testttype that the operator ^^^ uses. This
> does not cause the operator to be deleted, it simply reverts its left and
> right args to 'NONE'.
No, it doesn't "revert the types to NONE", because there isn't any such
type as NONE. What you've got is an operator whose argument types refer
to a nonexistent type OID. You won't be able to drop it with DROP
OPERATOR because you can't name the now-gone type.
There's been talk of having interlocks that prevent you from dropping
a still-referenced type, function, etc, but they're not there now.
I'd suggest cleaning up by executing commands like
delete from pg_operator where oprleft = oid-of-vanished-type
(if you don't know what the type's oid was, a little crosschecking of
pg_operator against pg_type will tell you).
regards, tom lane
