LeftTuple next = leftTuple.getStagedNext();
final AccumulateContext accctx = (AccumulateContext) leftTuple.getObject();
PropagationContext context = leftTuple.getPropagationContext();
constraints.updateFromTuple(contextEntry,
wm,
leftTuple);
FastIterator rightIt = accNode.getRightIterator(rtm);
RightTuple rightTuple = accNode.getFirstRightTuple(leftTuple,