Re: [HACKERS] COPY as a set returning function

Here is a 4: Refactoring BeginCopyFrom so as instead of a Relation are
used a TupleDesc, a default expression list, and a relation name. You
could as well make NextCopyFrom() smarter so as it does nothing if no
expression contexts are given by the caller, which is the case of your
function here. To be honest, I find a bit weird to use
NextCopyFromRawFields when there is already a bunch of sanity checks
happening in NextCopyFrom(), where you surely want to have them
checked even for your function.

Looking at the last patch proposed, I find the current patch proposed
as immature, as rsTupDesc basically overlaps with the relation a
caller can define in BeginCopyFrom(), so marking this patch as
"returned with feedback".
--
Michael