Andreas Pflug <[EMAIL PROTECTED]> writes:
> 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?

Right offhand I think text<->varchar and adjustment of length limits in
char, varchar, and perhaps numeric would be the only things useful
enough to worry about handling.

                        regards, tom lane

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