Re: Adding integers ( > 8 bytes) to an inet

Kristian

assuming the max size of 8 byte integer is
http://www.postgresql.org/docs/8.1/static/datatype.html
bigint8 byteslarge-range integer-9223372036854775808 to 9223372036854775807
i dont know if a IPV6 address
999999 999999 999999 999999 would fit into
9,223,372,036,854,775,807 boundary

i think you discovered the bug!

if you feel you have a solution try submitting a patch
http://wiki.postgresql.org/wiki/Submitting_a_Patch

please ping ping pgsql-hackers(at)postgresql(dot)org

Good Catch!
Martin Gainty
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> Date: Tue, 8 Sep 2009 15:58:25 +0200
> From: kristian(at)spritelink(dot)net
> To: pgsql-general(at)postgresql(dot)org
> Subject: [GENERAL] Adding integers ( > 8 bytes) to an inet
>
> Hello!
>
> I'm having some trouble with the inet data type and its
> operators. Right now I'm relying on operations such as
>
> kll=# SELECT '10.0.0.0/24'::inet + (2^(32-24))::integer;
> ?column?
> -------------
> 10.0.1.0/24
> (1 row)
>
> to get the "next" available /24. This works all fine and dandy
> for IPv4 since I'll never go beyond what an integer has to offer.
> Expanding my application to IPv6 will on the other hand cause me
> some trouble since 2^128 won't fit in an integer and not in a
> bigint either. I tried numeric;
>
> kll=> SELECT '2000::/48'::inet + (2^(128-96))::numeric(100);
> ERROR: operator does NOT exist: inet + numeric
> LINE 1: SELECT '2000::/48'::inet + (2^(128-96))::numeric(100);
> ^
> HINT: No operator matches the given name AND argument type(s). You might need TO ADD explicit type casts.
>
>
> And poking in pg_operator / pg_type seems to confirm this:
>
> nils=# SELECT (SELECT typname FROM pg_type WHERE typelem=oprleft), oprname, (SELECT typname FROM pg_type WHERE typelem=oprright) FROM pg_operator WHERE oprleft=(SELECT typelem FROM pg_type WHERE typname='_inet') AND oprname='+';
> ?column? | oprname | ?column?
> ----------+---------+----------
> _inet | + | _int8
> (1 row)
>
> I could hack together some kluge to loop through, but it all
> becomes quite ugly after a while and I would rather see some way
> to add a numeric.
>
> Am I doing it the wrong way? Bug?
> What to do?
>
> Kind regards,
> Kristian.
>
> --
> Kristian Larsson KLL-RIPE
> +46 704 264511 kll(at)spritelink(dot)net
>
> --
> Sent via pgsql-general mailing list (pgsql-general(at)postgresql(dot)org)
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