RightTupleList rightTuples = dquery.getResultUpdateRightTupleList();
if ( rightTuples == null ) {
rightTuples = new RightTupleList();
dquery.setResultUpdateRightTupleList(rightTuples);
QueryResultUpdateAction updateAction = new QueryResultUpdateAction( context,
this.factHandle,
leftTuple,
this.node );
context.getQueue2().addFirst( updateAction );
}