OrderItem 지연로딩 쿼리

안녕하세요 선생님.

강의에서 궁금한 점이 생겨서 질문드립니다.

List<OrderDto> orders = orderRepository.findALlWithMemberDelivery(offset, limit)
        .stream().map(o -> new OrderDto(o)).collect(toList());

 멤버와 딜리버리가 페치조인된 첫번째 쿼리가 나가고 

지연로딩으로 OrderItem을  조회하는 쿼리에서

    select
        orderitems0_.order_id as order_id5_5_0_, 
        orderitems0_.order_item_id as order_it1_5_0_,
        orderitems0_.order_item_id as order_it1_5_1_,
        orderitems0_.count as count2_5_1_,
        orderitems0_.item_id as item_id4_5_1_,
        orderitems0_.order_id as order_id5_5_1_,
        orderitems0_.order_price as order_pr3_5_1_ 
    from
        order_item orderitems0_ 
    where
        orderitems0_.order_id=?

order_id와 order_item_id가 select문에 두번씩 조회되는데 왜 그런지 생각해봐도 이유를 모르겠네요ㅜㅜ

감사합니다!!