@Override
    public List<Traversal.Admin<S, C>> getLocalChildren() {
        return (List) this.comparators.stream().map(Pair::getValue0).collect(Collectors.toList());
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/OrderGlobalStep.java