docs: private Scanner getScanner(final byte[] table) throws HBaseException {
      short metric_width = TSDB.metrics_width();
      final byte[] start_row = 
        Arrays.copyOfRange(Bytes.fromLong(start_id), 8 - metric_width, 8);
      final byte[] end_row = 
        Arrays.copyOfRange(Bytes.fromLong(end_id), 8 - metric_width, 8);
      final Scanner scanner = tsdb.getClient().newScanner(table);
      scanner.setStartKey(start_row);
      scanner.setStopKey(end_row);
      scanner.setFamily(NAME_FAMILY);
      return scanner;
    }