@Override
    public OrderGlobalStep<S, C> clone() {
        final OrderGlobalStep<S, C> clone = (OrderGlobalStep<S, C>) super.clone();
        clone.comparators = new ArrayList<>();
        for (final Pair<Traversal.Admin<S, C>, Comparator<C>> comparator : this.comparators) {
            clone.comparators.add(new Pair<>(comparator.getValue0().clone(), comparator.getValue1()));
        }
        return clone;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/OrderGlobalStep.java