test.py

def mongo(filter):
    result = list(db.user.find({'name': {'$gt': filter}}).sort('name').limit(100))
    parents = set()
    for d in result:
        parents.add(d['parent'])

    parents = db.user.find({'_id': {'$in': list(parents)}})
    assert len(result) == 100

def orient(filter):
    q = 'select name, parent.name from User where name > "{}" order by name limit 100'.format(filter)
    result = client.query(q)
    assert len(result) == 100