@Override
        public Traversal<Vertex, String> get_g_VX1X_groupXaX_byXconstantXaXX_byXnameX_selectXaX_selectXaX(final Object v1Id) {
            return g.V(v1Id).group("a").by(__.constant("a")).by(__.values("name"))
                    .barrier() // TODO: this barrier() should not be necessary
                    .select("a").select("a");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/SelectTest.java