code: @Deprecated
  	public void setFirstInputs(List<Operator<IN1>> inputs) {
  		this.input1 = Operator.createUnionCascade(inputs);
  	}
docs: Sets the first input to the union of the given operators.
  
  @param inputs The operator(s) that form the first inputs.
  @deprecated This method will be removed in future versions. Use the {@link Union} operator instead.