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Fixed #21376 -- New implementation for query join promotion logic

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This commit introduced a new class JoinPromoter that can be used to
abstract away join promotion problems for complex filter conditions.
Query._add_q() and Query.combine() now use the new class.

Also, added a lot of comments about why join promotion is done the way
it is.

Thanks to Tim Graham for original report and testing the changes, and
for Loic Bistuer for review.
This commit is contained in:
Anssi Kääriäinen 2013-11-04 18:04:57 +02:00
parent ae029b440a
commit 6fe2b001db
4 changed files with 161 additions and 137 deletions
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4
tests/queries/models.py
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@ -412,8 +412,8 @@ class ObjectB(models.Model):
@python_2_unicode_compatible
class ObjectC(models.Model):
name = models.CharField(max_length=50)
objecta = models.ForeignKey(ObjectA)
objectb = models.ForeignKey(ObjectB)
objecta = models.ForeignKey(ObjectA, null=True)
objectb = models.ForeignKey(ObjectB, null=True)
def __str__(self):
return self.name