code: public UnionOperator<T> union(DataSet<T> other){
  		return new UnionOperator<>(this, other, Utils.getCallLocationName());
  	}
docs: Creates a union of this DataSet with an other DataSet. The other DataSet must be of the same data type.
  
  @param other The other DataSet which is unioned with the current DataSet.
  @return The resulting DataSet.