code: @VisibleForTesting
    RangeSet<RowKeyWrapper> rowSetToRangeSet(RowSet btRowSet) {
      RangeSet<RowKeyWrapper> rangeSet = TreeRangeSet.create();
      for (RowRange btRowRange : btRowSet.getRowRangesList()) {
        rangeSet.add(rowRangeToRange(btRowRange));
      }
      for (ByteString key : btRowSet.getRowKeysList()) {
        rangeSet.add(Range.singleton(new RowKeyWrapper(key)));
      }
      return rangeSet;
    }
docs: Convert bigtable's {@link RowSet} -> Guava's {@link RangeSet}.
  Note that this will normalize the ranges, such that: overlapping keys and ranges will be merged
  and empty range keys will be converted in boundless ranges.