union with querying multiple objects problem

If union queries with multiple objects the result is not as expected

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy import Column, Integer, String, ForeignKey
from sqlalchemy.orm import sessionmaker


Base = declarative_base()
class Usr(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key = True)
    name = Column(String)

class Addr(Base):
    __tablename__ = 'addresses'

    id = Column(Integer, primary_key = True)
    user_id = Column(Integer, ForeignKey('users.id'))
    addr = Column(String)
    name = Column(String)

engine = create_engine("sqlite:///:memory:")

Base.metadata.create_all(engine)
session = sessionmaker(bind=engine)()
session.add(Usr(id=1, name='name1'))
session.add(Addr(id=1, user_id=1, addr='addr1', name='addrname1'))
session.add(Usr(id=2, name='name2'))
session.add(Addr(id=2, user_id=2, addr='addr2', name='addrname2'))

q1 = session.query(Usr, Addr).join((Addr, Addr.user_id == Usr.id)).filter(Addr.addr == 'addr1')
q2 = session.query(Usr, Addr).join((Addr, Addr.user_id == Usr.id)).filter(Addr.addr == 'addr2')
q3 = q2.union(q1)

length of q3.all() is 4 but expected 2

value of q3.all()0 1.name is 'name1' but expected 'addrname1'

and warning issued: /usr/lib/python2.6/site-packages/sqlalchemy/sql/expression.py:1674: SAWarning: Column 'id' on table 'Select object' being replaced by another column with the same key. Consider use_labels for select() statements.

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