"Vadim I. Passynkov" <pvi@axxent.ca> writes:
> I ask now about why logical same functions host(inet) and netmask(inet)
> return different types ?
There was a *long* discussion about this last year, and we concluded
that was the right thing to do. See the mail archives if you want the
details --- but the key point is that host() text() and abbrev() are
primarily useful to allow non-default display formatting of inet/cidr
values, so they should produce text. If they produced another inet
value then they'd be unable to control how that value got formatted
for display.
regards, tom lane
