for ( RightTuple rightTuple : previousMatches.values() ) {
for ( RightTuple current = rightTuple; current != null; current = (RightTuple) rightIt.next( current ) ) {
LeftTuple childLeftTuple = current.getFirstChild();
childLeftTuple.unlinkFromLeftParent();
childLeftTuple.unlinkFromRightParent();
switch ( childLeftTuple.getStagedType() ) {
// handle clash with already staged entries
case LeftTuple.INSERT :
stagedLeftTuples.removeInsert( childLeftTuple );