@Override
        public Traversal<Vertex, Map<String, Long>> get_g_V_hasLabelXpersonX_chooseXageX__optionX27L__constantXyoungXX_optionXnone__constantXoldXX_groupCount() {
            return g.V().hasLabel("person").choose(values("age"))
                    .option(27L, __.constant("young"))
                    .option(Pick.none, __.constant("old"))
                    .groupCount();
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Joshua Shinavier (http://fortytwo.net)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/ChooseTest.java