code: @Deprecated
  	@SuppressWarnings("unchecked")
  	public void addFirstInputs(List<Operator<IN1>> inputs) {
  		this.input1 = Operator.createUnionCascade(this.input1, inputs.toArray(new Operator[inputs.size()]));
  	}
docs: Add to the first input the union of the given operators.
  
  @param inputs The operator(s) to be unioned with the first input.
  @deprecated This method will be removed in future versions. Use the {@link Union} operator instead.