@Override
    public int hashCode() {
        int result = super.hashCode() ^ this.connective.hashCode();
        for (final Traversal t : this.matchTraversals) {
            result ^= t.hashCode();
        }
        return result;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/MatchStep.java