public void beforeFirst() throws SQLException {
        throw new UnsupportedOperationException();
    }
Moves this <code>CachedRowSetImpl</code> object's cursor to the front of
the rowset, just before the first row. This method has no effect if
this rowset contains no rows.

@throws SQLException if an error occurs or the type of this rowset
           is <code>ResultSet.TYPE_FORWARD_ONLY</code>
src/main/java/org/replicadb/rowset/sun/rowset/internal/SyncResolverImpl.java