code: @Deprecated
  	public void setSecondInputs(List<Operator<IN2>> inputs) {
  		this.input2 = Operator.createUnionCascade(inputs);
  	}
docs: Sets the second input to the union of the given operators.
  
  @param inputs The operator(s) that form the second inputs.
  @deprecated This method will be removed in future versions. Use the {@link Union} operator instead.