Branch: refs/heads/master
Home: https://github.com/django/django
Commit: a193372753ad9d1d15ad5e2d6d06bbc07ca3f433
https://github.com/django/django/commit/a193372753ad9d1d15ad5e2d6d06bbc07ca3f433
Author: Anssi Kääriäinen <akaar...@gmail.com>
Date: 2012-08-21 (Tue, 21 Aug 2012)
Changed paths:
M django/db/models/sql/query.py
M tests/regressiontests/queries/models.py
M tests/regressiontests/queries/tests.py
Log Message:
-----------
Fixed #17886 -- Fixed join promotion in ORed nullable queries
The ORM generated a query with INNER JOIN instead of LEFT OUTER JOIN
in a somewhat complicated case. The main issue was that there was a
chain of nullable FK -> non-nullble FK, and the join promotion logic
didn't see the need to promote the non-nullable FK even if the
previous nullable FK was already promoted to LOUTER JOIN. This resulted
in a query like a LOUTER b INNER c, which incorrectly prunes results.
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