인프런 커뮤니티 질문&답변

try {
            Team teamA = new Team();
            teamA.setName("팀A");
            em.persist(teamA);

            Team teamB = new Team();
            teamB.setName("팀B");
            em.persist(teamB);

            Member member1 = new Member();
            member1.setUsername("회원1");
            member1.setTeam(teamA);
            em.persist(member1);

            Member member2 = new Member();
            member2.setUsername("회원2");
            member2.setTeam(teamA);
            em.persist(member2);

            Member member3 = new Member();
            member3.setUsername("회원3");
            member3.setTeam(teamB);
            em.persist(member3);

            em.flush();
            em.clear();

            String query = "select m from Member m";

            List<Member> result = em.createQuery(query, Member.class)
                    .getResultList();

            for (Member member : result) {
                System.out.println("member = " + member.getUsername() + ", " 
                        + member.getTeam().getName());
            }

Hibernate: 
    /* select
        m 
    from
        Member m */ select
            member0_.id as id1_0_,
            member0_.age as age2_0_,
            member0_.TEAM_ID as team_id5_0_,
            member0_.type as type3_0_,
            member0_.username as username4_0_ 
        from
            Member member0_
Hibernate: 
    select
        team0_.id as id1_3_0_,
        team0_.name as name2_3_0_ 
    from
        Team team0_ 
    where
        team0_.id in (
            ?, ?
        )
member = 회원1, 팀A
member = 회원2, 팀A
member = 회원3, 팀B

회원1을 조회하면서 회원과 팀에 대한 select 쿼리가 나가고 회원1을 조회하면서 teamA가 영속성 컨텍스트에 올라갔으니 회원2는 1차 캐시에서 가져온다고 했습니다. 그러면 teamB는 영속성 컨텍스트에 없기 때문에 team에 대한 쿼리가 발생해야 하는데 발생하지 않습니다.

왜 강의와 다르게 쿼리가 발생하는지 궁금합니다.