Laravel 5.6块与groupBy

Question

我在下面执行时遇到错误，而没有groupBy则工作正常。

    User::select('col')->groupBy('col1')->chunk(100, function ($users) {
        foreach ($users as $user) {
            dump($user);
        }
    });

错误：

SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column