Jaime Casanova <[email protected]> writes:
> Hi, any reason not to implement an ALTER CAST statement?

Mainly, because we don't really *want* every thinks-he-knows-something
DBA fooling around with the built-in casts.  If he actually knows enough
to know whether it's safe, then he knows enough to do it by poking the
catalogs.

                        regards, tom lane

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