> Hm, you're right, 'thou I wouldn't recommend this to the average user,
> and wonder if this will be possible for all future pgsql versions too.
> I'm considering adding safe support for this type of column change to
> pgAdmin3.
> There might be other cases of legal direct change of system catalog
> entries, e,g. varchar to text, if they all are only names for internally
> identical data structures. Can you tell which datatypes may be legally
> interchanged?
Yes, you can check if they're binary compatible from the pg_cast table....
Chris