php - How to determine columns that will be returned in the result when using `paginate()` method in Laravel?

I have 2 tables:users andarticles. To fetch all columns from thearticles table and onlyuser_name column from theusers table, I use this code:

$articles = Article::join('users', 'articles.user_id', '=', 'users.user_id')
    ->get(array('articles.*', 'users.user_name'));
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and it works fine, but when I usepaginate() method like this:

$articles = Article::join('users', 'articles.user_id', '=', 'users.user_id')
    ->paginate(10);
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it fetches all columns from both tables, which I don't want. My question is: How can I select columns that will be returned in the result if I usepaginate() method in Laravel framework?