public boolean last() throws SQLException {
        checkState();

        boolean b = rs.last();
        notifyCursorMoved();
        return b;
    }
Moves the cursor to the last row in
this rowset's <code>ResultSet</code> object.

@return <code>true</code> if the cursor is on a valid row;
<code>false</code> if there are no rows in the result set
@throws SQLException if (1) a database access error occurs,
           (2) the result set type is <code>TYPE_FORWARD_ONLY</code>,
           or (3) this rowset does not currently have a valid
           connection, prepared statement, and result set
src/main/java/org/replicadb/rowset/sun/rowset/JdbcRowSetImpl.java