code: public static QuandlCodeRequest allColumns(final String quandlCode) {
      ArgumentChecker.notNull(quandlCode, "quandlCode");
      return new QuandlCodeRequest(quandlCode, null);
    }
docs: Request all columns for a given quandlCode.
  
  @param quandlCode the Quandl code you're interested in, not null
  @return an request instance, not null