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Re: Function Column Expansion Causes Inserts To Fail

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Merlin Moncure <mmoncure@xxxxxxxxx> writes:
> I've never taken the time to really get my head around 'lateral'
> enough to say for sure if it provides clean workarounds for all the
> cases that get people into hot water.  The case that used to get me a
> lot is (the unfortunately generally under utilized) custom aggregates.

> problem:
> select bar_id, (some_agg(foo)).* from foo join bar ... group by bar_id;

Hm, really?  I'd expect that nodeAgg's attempts to collect identical
aggregate calls into one would keep you out of trouble there.  That
hack unfortunately doesn't generalize to ordinary functions ...

			regards, tom lane

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