public boolean columnUpdated(String columnName) throws SQLException {
      return columnUpdated(getColIdxByName(columnName));
   }
Indicates whether the designated column of the current row of
this <code>StreamingRowSetImpl</code> object has been updated. The
value returned depends on whether this rowset can detcted updates:
<code>false</code> will always be returned if it does not detect updates.

@param columnName the <code>String</code> column name column that may be have
been updated.
@return <code>true</code> is the designated column has been updated
and the rowset detects updates; <code>false</code> if the rowset has not
been updated or the rowset does not detect updates
@throws SQLException if the cursor is on the insert row or not
         on a valid row
@see DatabaseMetaData#updatesAreDetected
src/main/java/org/replicadb/rowset/StreamingRowSetImpl.java