Re: Aggregate ORDER BY patch

Andrew Gierth wrote:
> Herewith a patch to implement agg(foo ORDER BY bar) with or without
> DISTINCT, etc.

What does that mean? Aggregate functions are supposed to be commutative,
right?

> No artificial restrictions are imposed on what
> syntactical combinations are allowed. However, ORDER BY is not allowed
> with aggregates used as window functions (as per the existing
> restriction on DISTINCT).

How is this different from window functions?

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