Peter Eisentraut <peter_e@gmx.net> writes:
> And this could then also change the return type of foo(), thus changing the
> row type of the view and would thus propogate up to other views. And so if
> you have "many views", as you say, this could become a great mess. You could
> probably define and implement a solution, but it would be very confusing and
> risky to use.
The SQL committee has also historically chosen to punt on such things.
Note the long-established rule that "*" is expanded at view definition
time (so adding columns doesn't change views). I also see a flat
prohibition on *any* view reference in the newly added SET DATA TYPE
command (SQL:2008 11.17 <alter column data type clause>):
7) C shall not be referenced in the <query expression> of any view descriptor.
regards, tom lane
