Oleg Bartunov <oleg@sai.msu.su> writes:
> AFAIK, it's required to write min(),max() aggregate functions for
> user-defined types even if compare function is already defined for
> this type. Is't possible to get these functions working for
> such user-defined types automatically ?
Doesn't really seem worth the trouble. We'd need some sort of notion
of a generic aggregate function; and even then, you'd have to tell the
system what comparison function to use for your datatype.
regards, tom lane