@Override
    public int hashCode() {
        int result = super.hashCode();
        for (int i = 0; i < this.comparators.size(); i++) {
            result ^= this.comparators.get(i).hashCode() * (i + 1);
        }
        return result;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/OrderGlobalStep.java