Re: contrib/xinetops for 8.1 "patch" - Mailing list pgsql-patches

Bruce Momjian <pgman@candle.pha.pa.us> writes:
> A larger problem is this:

>     test=> SELECT '255.255.255.0'::inet - '1.1.1.1'::inet;
>      ?column?
>     -----------
>      -16843265
>     (1 row)

> Should subtraction return int8?

Probably, and for that matter the addition operators should take int8;
on IPV6 data even that's not really wide enough.

> We don't have an unsigned data type.  Of course we also have this
> excitement:

>     test=> SELECT '255.255.255.0'::inet +  1000000;
>       ?column?
>     ------------
>      0.15.65.64
>     (1 row)

> so we underflow and overflow cleanly.  Not great, but it works.

"Cleanly" isn't the adjective I'd use for that.  There should be an
overflow error.

            regards, tom lane