public RowId getRowId(String columnName) throws SQLException {
      throw new SQLFeatureNotSupportedException(resBundle.handleGetObject("cachedrowsetimpl.opnotysupp").toString());
   }
Retrieves the value of the designated column in the current row of this
<code>ResultSet</code> object as a java.sql.RowId object in the Java
programming language.

@param columnName the name of the column
@return the column value if the value is a SQL <code>NULL</code> the
    value returned is <code>null</code>
@throws SQLException if a database access error occurs
@since 6.0
src/main/java/org/replicadb/rowset/StreamingRowSetImpl.java