@Override
    public String toString() {
      return this.getClass().getSimpleName() + " [" + rowToStr(firstRow()) + ","
        + rowToStr(lastRow()) + "]";
    }
Returns the BigInteger represented by the byte array
@param row byte array representing row
@return the corresponding BigInteger
hbase-server/src/main/java/org/apache/hadoop/hbase/util/RegionSplitter.java