@Override
        public Traversal<Vertex, Map<String, Long>> get_g_V_chooseXlabel_is_person__unionX__out_lang__out_nameX__in_labelX_groupCount() {
            return (Traversal) g.V().choose(label().is("person"), union(out().values("lang"), out().values("name")), in().label()).groupCount();
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/UnionTest.java