for (RightTuple current = rightTuple; current != null; current = (RightTuple) rightIt.next(current)) {
LeftTuple childLeftTuple = current.getFirstChild();
if (childLeftTuple != null) {
// childLeftTuple is null, if the constraints in the 'from' pattern fail
childLeftTuple.unlinkFromLeftParent();
childLeftTuple.unlinkFromRightParent();
switch (childLeftTuple.getStagedType()) {
// handle clash with already staged entries
case LeftTuple.INSERT:
stagedLeftTuples.removeInsert(childLeftTuple);