Fixed #32693 -- Quoted and lowercased generated column aliases.

django/db/models/sql/compiler.py

@@ -554,7 +554,10 @@ class SQLCompiler:
                     if alias:
                         s_sql = '%s AS %s' % (s_sql, self.connection.ops.quote_name(alias))
                     elif with_col_aliases:
-                        s_sql = '%s AS %s' % (s_sql, 'Col%d' % col_idx)
+                        s_sql = '%s AS %s' % (
+                            s_sql,
+                            self.connection.ops.quote_name('col%d' % col_idx),
+                        )
                         col_idx += 1
                     params.extend(s_params)
                     out_cols.append(s_sql)

tests/queries/tests.py

@@ -7,7 +7,7 @@ from threading import Lock
 
 from django.core.exceptions import EmptyResultSet, FieldError
 from django.db import DEFAULT_DB_ALIAS, connection
-from django.db.models import Count, Exists, F, OuterRef, Q
+from django.db.models import Count, Exists, F, Max, OuterRef, Q
 from django.db.models.expressions import RawSQL
 from django.db.models.sql.constants import LOUTER
 from django.db.models.sql.where import NothingNode, WhereNode
@@ -1855,6 +1855,17 @@ class Queries6Tests(TestCase):
             [self.t5, self.t4],
         )
 
+    def test_col_alias_quoted(self):
+        with CaptureQueriesContext(connection) as captured_queries:
+            self.assertEqual(
+                Tag.objects.values('parent').annotate(
+                    tag_per_parent=Count('pk'),
+                ).aggregate(Max('tag_per_parent')),
+                {'tag_per_parent__max': 2},
+            )
+        sql = captured_queries[0]['sql']
+        self.assertIn('AS %s' % connection.ops.quote_name('col1'), sql)
+
 
 class RawQueriesTests(TestCase):
     @classmethod