> It seems that BitSet adds complexity without fully solving the problem.
The bitset is just a no-brain-update for the old code with "int fieldIndex" kind of storage. Nothing new. RexNodes might indeed be helpful, however I think we need to define the accepted variations (e.g. just InputRefs and FieldAcesses) so we do not mix Correlate and Project functionality in the CorrelateRel. Vladimir
