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public function doMainQuery( $conds, $opts ) {
        global $wgUser;

        $tables = array( 'recentchanges' );
        $join_conds = array(); // 1.)
        $query_options = array( 'USE INDEX' => array('recentchanges' => 'rc_timestamp') );

        $uid = $wgUser->getId();
        $dbr = wfGetDB( DB_SLAVE );
        $limit = $opts['limit'];
        $namespace = $opts['namespace'];
        $invert = $opts['invert'];

        $join_conds = array(); // 2.) doublure