On Mon, 2011-10-24 at 15:05 +0400, Alexander Korotkov wrote:
> I think implementing subtype_diff for each datatype is ok. We could
> implement some universal function based on minus operator and casting
> to double precision. But such solution might be unacceptable in
> both predictability (operator and casting function might do not the
> things we expect) and performance.
>
Done.
Everything is complete in this patch with the exception of two optional
things, which I still intend to do but might best be done in a separate
commit:
* support typmod for ranges
* support casts between different range types
Both of these things, I believe, require the introduction of an
RangeCoerceExpr, similar to ArrayCoerceExpr. That's fine, but it creates
a rather large diff, so it might be best left for a later commit.
Regards,
Jeff Davis