@Override
    public List<Traversal.Admin<S, E>> getLocalChildren() {
        return Collections.unmodifiableList(this.coalesceTraversals);
    }
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/CoalesceStep.java