docs: protected List appendListOfColumns(String[] columns, StringBuffer buf)
      {
          ArrayList columnList = new ArrayList();
  
          for (int i = 0; i < columns.length; i++)
          {
              if (i > 0)
              {
                  buf.append(",");
              }
              appendColName(columns[i], false, null, buf);
              columnList.add(columns[i]);
          }
          return columnList;
      }