public int compareKeyForNextRow(ExtendedCell nextIndexed, ExtendedCell currentCell) {
    return PrivateCellUtil.compareKeyBasedOnColHint(rowComparator, nextIndexed, currentCell, 0, 0,
      null, 0, 0, PrivateConstants.OLDEST_TIMESTAMP, Type.Minimum.getCode());
  }
@param nextIndexed the key of the next entry in the block index (if any)
@param currentCell The Cell we're using to calculate the seek key
@return result of the compare between the indexed key and the key portion of the passed cell
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.java