Re: [BUGS] INET operators and NOT

Tomas Cerha <t(dot)cerha(at)sh(dot)cvut(dot)cz> writes:
> Aplying the NOT operator with << INET operator results always in false.

> accounting=> SELECT * FROM a;
> ip
> --------
> 10.1.1.1
> 10.1.1.2
> 10.2.1.2
> 10.2.1.1
> (4 rows)

> accounting=> SELECT * FROM a WHERE ip<<'10.1/16';
> ip
> --------
> 10.1.1.1
> 10.1.1.2
> (2 rows)

> accounting=> SELECT * FROM a WHERE NOT ip<<'10.1/16';
> ip
> --
> (0 rows)

What's going on here is that the optimizer is simplifying "NOT x<<y"
(network_sub) into "x>>=y" (network_supeq), because the pg_operator
entry for << claims that >>= is its negator. This example demonstrates
that that ain't so.

Can anyone comment on whether any of the inet operators are actually the
correct negator of << ? For that matter, are inet's other commutator
and negator declarations just as broken?

regards, tom lane