Attached is a patch which fixes an oversight in _outAgg(): the
"grpColIdx" and "grpOperators" fields of the Agg struct were not emitted
by _outAgg(). I don't see any good reason to omit this information.
Note that while the "grpOperators" field was added during the 8.3 devel
cycle, the "grpColIdx" field has been around since '02 (without outfuncs
support). So I can backpatch that portion of the patch to back branches
if anyone feels strongly.
-Neil
