RepeatStep optimization looses label information.

[pietermartin]

The following code illustrates the problem.

    @Test
    public void testRepeatEmitLabel4() {
        loadModern();
        GraphTraversal<Vertex, Map<String, Vertex>> traversal = this.sqlgGraph.traversal()
                .V().as("a")
                .repeat(out()).times(1).emit().as("b")
                .select("a", "b");
        printTraversalForm(traversal);
        int count = 0;
        while (traversal.hasNext()) {
            Map<String, Vertex> vertexMap = traversal.next();
            System.out.println(vertexMap);
            count++;
        }
        System.out.println(count);
    }

The "b" label is being lost in the RepeatStep optimization.