@Override
  public int compareRows(final Cell left, final Cell right) {
    return compareRows(left, left.getRowLength(), right, right.getRowLength());
  }
Compares the rows of the left and right cell. For the hbase:meta case this method is overridden
such that it can handle hbase:meta cells. The caller should ensure using the appropriate
comparator for hbase:meta.
@return 0 if both cells are equal, 1 if left cell is bigger than right, -1 otherwise
hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparatorImpl.java