@Override
    public void mergeInto(final TraversalSideEffects sideEffects) {
        this.sideEffects.mergeInto(sideEffects);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/traversal/MemoryTraversalSideEffects.java