> 
> 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

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