code: @Deprecated
  	@SuppressWarnings("unchecked")
  	public void addSecondInputs(List<Operator<IN2>> inputs) {
  		this.input2 = Operator.createUnionCascade(this.input2, inputs.toArray(new Operator[inputs.size()]));
  	}
docs: Add to the second input the union of the given operators.
  
  @param inputs The operator(s) to be unioned with the second input.
  @deprecated This method will be removed in future versions. Use the {@link Union} operator instead.