@Override
        public Traversal<Vertex, String> get_g_V_out_group_byXlabelX_selectXpersonX_unfold_outXcreatedX_name_limitX2X() {
            return g.V().out().<String, Vertex>group().by(T.label).select("person").unfold().out("created").<String>values("name").limit(2);
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/GroupTest.java