Mark Dilger <> writes:
> The fact that a final function may be called
> multiple times does not appear to be mentioned
> in the docs,

It's in xaggr.sgml, near the discussion of AggCheckCallContext
(the end of section 35.10, in current HEAD's section numbering).

In general, people writing C functions should not expect that they
can scribble on pass-by-ref arguments, so I don't see a need to
belabor the point in multiple places.

                        regards, tom lane

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