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