@Override
    public void setTraversal(final Traversal.Admin<?, ?> parentTraversal) {
        super.setTraversal(parentTraversal);
        for (final Traversal.Admin<S, E> conjunctionTraversal : this.coalesceTraversals) {
            this.integrateChild(conjunctionTraversal);
        }
    }
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/CoalesceStep.java