Django ORM Creates Phantom Alias in SQL Join - mysql

Question

I am executing the following code (names changed to protect the innocent, so the model structure might seem weird):
memberships =
models.Membership.objects.filter(
degree__gt=0.0,
group=request.user.get_profile().group
)
exclude_count =
memberships.filter(
member__officerships__profile=request.user.get_profile()
).count()
if exclude_officers_with_profile:
memberships = memberships.exclude(
member__officerships__profile=request.user.get_profile()
)
total_count = memberships.count()
which at this point results in:
OperationalError at /
(1054, "Unknown column 'U1.id' in 'on clause'")
The SQL generated is:
SELECT
COUNT(*)
FROM
`membership`
WHERE (
`membership`.`group_id` = 2 AND
`membership`.`level` > 0.0 AND
NOT (
`membership`.`member_id`
IN (
SELECT
U2.`member_id`
FROM
`membership` U0 INNER JOIN `officers` U2
ON (U1.`id` = U2.`member_id`)
WHERE U2.`profile_id` = 2
)
)
)
It appears that the SQL Join's ON statement is referencing an alias that hasn't been defined. Any ideas why!? I dropped my MySQL database and re-synced the tables from my models to try and ensure that there weren't any inconsistencies there.
The structure of the models I'm using are:
class Membership(models.Model):
member = models.ForeignKey(Member, related_name='memberships')
group = models.ForeignKey(Group, related_name='memberships')
level = models.FloatField(default=0.0)
class Member(models.Model):
name = models.CharField(max_length=32)
class Officer(models.Model):
member = models.ForeignKey(Member, related_name='officerships')
profile = models.ForeignKey(UserProfile)
class UserProfile(models.Model)
group = models.ForeignKey(Group)
class Group(models.Model)
pass

Answer 1

I think this may be a symptom of:
http://code.djangoproject.com/ticket/9188
which was fixed as of django revision 9589, I think. Now how to figure out which revision I'm working from...
Confirmed. When I implemented the change referenced in the ticket above:
http://code.djangoproject.com/changeset/9589
my error went away.