[2.0.x] Fixed #28689 -- Fixed unquoted table names in Subquery SQL when using OuterRef.

Regression in f48bc7c3db.

Backport of 81e357a7e1 from master

django/db/models/expressions.py

@@ -997,7 +997,7 @@ class Subquery(Expression):
                 )
                 # Add table alias to the parent query's aliases to prevent
                 # quoting.
-                if hasattr(resolved, 'alias'):
+                if hasattr(resolved, 'alias') and resolved.alias != resolved.target.model._meta.db_table:
                     clone.queryset.query.external_aliases.add(resolved.alias)
                 return resolved
             return child

docs/releases/1.11.7.txt

@@ -16,3 +16,6 @@ Bugfixes
 
 * Made ``QuerySet.reverse()`` affect ``nulls_first`` and ``nulls_last``
   (:ticket:`28722`).
+
+* Fixed unquoted table names in ``Subquery`` SQL when using ``OuterRef``
+  (:ticket:`28689`).

tests/expressions/models.py

@@ -50,6 +50,7 @@ class Experiment(models.Model):
     end = models.DateTimeField()
 
     class Meta:
+        db_table = 'expressions_ExPeRiMeNt'
         ordering = ('name',)
 
     def duration(self):

tests/expressions/tests.py

@@ -545,6 +545,11 @@ class BasicExpressionsTests(TestCase):
         expr = FuncB(FuncA())
         self.assertEqual(expr.output_field, FuncA.output_field)
 
+    def test_outerref_mixed_case_table_name(self):
+        inner = Result.objects.filter(result_time__gte=OuterRef('experiment__assigned'))
+        outer = Result.objects.filter(pk__in=Subquery(inner.values('pk')))
+        self.assertFalse(outer.exists())
+
 
 class IterableLookupInnerExpressionsTests(TestCase):
     @classmethod