>
> It really is. In fact, the feature was (IIRC) somewhat
> controversial, because there are all sorts of decisions that need to
> be made about what to do with incompatible types. What if you change
> from int8 to int4? What about varchar(4) to char(4)? Just to name
> two simple-minded examples. See the -general and -hackers archives
> for plenty of previous discussion of this stuff.
>
but that's the reason, the USING clause exists. It however still remains a
problem if triggers, constraints or referential integrity or vews are
involved.
so far
