diff options
Diffstat (limited to 'django/db/models/sql/query.py')
| -rw-r--r-- | django/db/models/sql/query.py | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py index 772ba13419..12066cd4f8 100644 --- a/django/db/models/sql/query.py +++ b/django/db/models/sql/query.py @@ -2035,11 +2035,10 @@ class Query(BaseExpression): ) condition.add(or_null_condition, OR) # Note that the end result will be: - # (outercol NOT IN innerq AND outercol IS NOT NULL) OR outercol IS NULL. - # This might look crazy but due to how IN works, this seems to be - # correct. If the IS NOT NULL check is removed then outercol NOT - # IN will return UNKNOWN. If the IS NULL check is removed, then if - # outercol IS NULL we will not match the row. + # NOT EXISTS (inner_q) OR outercol IS NULL + # this might look crazy but due to how NULL works, this seems to be + # correct. If the IS NULL check is removed, then if outercol + # IS NULL we will not match the row. return condition, needed_inner def set_empty(self): |