@Override
  public Cell getNextCellHint(Cell currentCell) {
    boolean result = tracker.updateTracker(currentCell);
    if (!result) {
      done = true;
      return null;
    }
    byte[] nextRowKey = tracker.nextRow();
    return PrivateCellUtil.createFirstOnRow(nextRowKey, 0, (short) nextRowKey.length);
  }
Returns the Fuzzy keys in the format expected by the constructor.
@return the Fuzzy keys in the format expected by the constructor
hbase-client/src/main/java/org/apache/hadoop/hbase/filter/FuzzyRowFilter.java