Mysql queries with the table name and "AS" for every column.

This code:

$user = User::findFirst(
           [
               'email=:email:',
               'bind' => [
                   ':email' => $email
               ],
               'columns' => 'id,  password'
           ]
       );

Produces this query:

SELECT `users`.`id` AS `id`, `users`.`password` AS `password`  FROM `users` WHERE `users`.`email` = :email LIMIT :2

Why it adds the table name and "AS" for every column? It's supposed to work like that or i need to modify something in the model or configuration?

The model is very basic since i'm just starting out.

class User extends \Phalcon\Mvc\Model
{

    public $id;

    public $email;

    public function getSource()
    {
        return "users";
    }
}

Thank you