@Override
  protected boolean isNewKey(ExtendedCell cell) {
    if (this.getLastCell() != null) {
      return !CellUtil.matchingRowColumn(cell, this.getLastCell());
    }
    return true;
  }
Handles ROWCOL bloom related context. It can work with both BytebufferdCells and byte[] backed
cells
hbase-server/src/main/java/org/apache/hadoop/hbase/util/RowColBloomContext.java