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