Greg Stark wrote:
> > > do it for multi-column keys. It seems it would be nice if some
> > > similar to (a,b,c) > (a1,b1,c1) worked for this.
> Hum. It would seem my intuition matches the SQL92 spec and Postgres
> this
> wrong.
> Even if Postgres did this right I'm not sure that would solve your
> woes.
> I imagine the first thing Postgres would do is rewrite it into regular
> scalar
> expressions. Ideally the optimizer should be capable of then deducing
> the
> scalar expressions that an index scan would be useful.

Wow.  For once, the standard is my friend.  Well, what has to be done?
:)  Does pg do it the way it does for a reason?  From the outside it
seems like the planner would have an easier job if it can make a field
by field comparison.  

Would a patch introducing the correct behavior (per the standard) be
accepted?  It seems pretty complicated (not to mention the planner


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