code: public void addRange(byte[] startRow, byte[] stopRow) {
      addRange(RowRange.newBuilder()
          .setStartKeyClosed(ByteStringer.wrap(startRow))
          .setEndKeyOpen(ByteStringer.wrap(stopRow))
          .build());
    }
docs: Adds a range to scan. This is similar to calling a combination of
  {@link Scan#setStartRow(byte[])} and {@link Scan#setStopRow(byte[])}. Other ranges can be
  constructed by creating a {@link RowRange} and calling {@link #addRange(RowRange)}
  @param startRow a byte array.
  @param stopRow a byte array.