query = Query(queries[0]._query_class._class_name)

In [1]: from leancloud import Query

In [2]: class MyQuery(Query):
   ...:     pass
   ...:

In [3]: type(MyQuery('User').or_(MyQuery('User'), MyQuery('User')))
Out[3]: leancloud.query.Query

In [1]: from leancloud import User

In [2]: User.query._query_class
Out[2]: leancloud.user.User

In [3]: User.query.or_(User.query, User.query)._query_class
Out[3]: leancloud.object_._User