private static void doDeleteSegmentMemory(LeftTuple leftTuple, PropagationContext context, SegmentMemory sm, InternalWorkingMemory wm, boolean linkOrNotify) {
LeftTupleSets leftTuples = sm.getStagedLeftTuples();
switch ( leftTuple.getStagedType() ) {
// handle clash with already staged entries
case LeftTuple.INSERT :
leftTuples.removeInsert( leftTuple );
break;
case LeftTuple.UPDATE :
leftTuples.removeUpdate( leftTuple );
break;
}