Re: Aggregates containing outer references don't work per

Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
>> When we considered outervar1 as a constant, we could do the aggregate in
>> the subquery using computations, but when SUM(outervar1) is computed in
>> an above query, combining that with anything that is part of different
>> query level makes no sense to me because those variables might not even
>> exist at the level that aggregate is being computed.
>
> Sure they will. They can only be outer (up-level) references, else the
> parser would not have resolved them in the first place.
>
> If you accept that SUM(localvar + outervar) is a sensible computation,
> then I think you must accept that SUM(outervar1 + outervar2) makes sense
> too. It's actually the exact same computation, it's just being
> referenced from within a sub-query.

What is SUM(up1levelvar + up2levelsvar) considered to be? Would that be
the same as SUM(localvar + outervar) one level up?

Jan

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