code: private void check_Min_Value(long l, int cIdx, int rowNumber, ParseWriter dout) {
      if (l <= Long.MIN_VALUE) {
        String warning = "Orc Parser: Long.MIN_VALUE: " + l + " is found in column "+cIdx+" row "+rowNumber +
            " of stripe "+_cidx +".  This value is used for sentinel and will not be parsed correctly.";
        dout.addError(new ParseWriter.ParseErr(warning, _cidx, rowNumber, -2L));
      }
    }
docs: This method is written to check and make sure any value written to a column of type long
  is more than Long.MIN_VALUE.  If this is not true, a warning will be passed to the user.
  
  @param l
  @param cIdx
  @param rowNumber
  @param dout