docs: private DataSet<Edge<K, EV>> getDistinctEdgeIntersection(DataSet<Edge<K, EV>> edges) {
  		return this.getEdges()
  				.join(edges)
  				.where(0, 1, 2)
  				.equalTo(0, 1, 2)
  				.with(new JoinFunction<Edge<K, EV>, Edge<K, EV>, Edge<K, EV>>() {
  					@Override
  					public Edge<K, EV> join(Edge<K, EV> first, Edge<K, EV> second) throws Exception {
  						return first;
  					}
  				}).withForwardedFieldsFirst("*").name("Intersect edges")
  				.distinct()
  					.name("Edges");
  	}