public boolean wasNull() throws SQLException {
        throw new UnsupportedOperationException();
    }
Reports whether the last column read was SQL <code>NULL</code>.
Note that you must first call the method <code>getXXX</code>
on a column to try to read its value and then call the method
<code>wasNull</code> to determine whether the value was
SQL <code>NULL</code>.

@return <code>true</code> if the value in the last column read
        was SQL <code>NULL</code>; <code>false</code> otherwise
@throws SQLException if an error occurs
src/main/java/org/replicadb/rowset/sun/rowset/internal/SyncResolverImpl.java