The spec defines array_agg(foo ORDER BY ...) which we don't implement
yet; obviously, we have no reason not to define this for any
aggregate, rather than just array_agg.

This doesn't seem to present any problems as far as the syntax goes,
and the actual execution is just a small matter of coding, but I'm not
seeing the best way to handle it in parse-analysis. All the existing
infrastructure for ORDER BY seems to be dependent on targetlists, which
obviously we don't have in the context of an aggregate call.

Ideas?

-- 
Andrew (irc:RhodiumToad)

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