Re: BETWEEN Help

Tom Lane wrote:
> "Christopher Kings-Lynne" <chriskl@familyhealth.com.au> writes:
> > The exact bits I need the advice on really are bits like this:
>
> >  if (expr_result >= lexpr_result &&
> >                                 expr_result <= rexpr_result)
>
> > I know this won't work, but how do I make it work?
>
> You'll need to look up the appropriate comparison operators and call
> them.
>
> My original thoughts about this involved storing the OIDs of the
> comparison operators in the BETWEEN node (probably in the form of
> Oper sub-nodes, to ease using the existing eval machinery).
> But that isn't the whole story; in some cases, it'll be necessary to
> coerce the inputs into comparable datatypes.

Is there special optimizer/index handling needed for BETWEEN that wasn't
needed before because it was transformed into AND/OR comparisons?

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