Refs #29563 -- Fixed SQLCompiler.execute_sql() to respect DatabaseFeatures.can_use_chunked_reads.

tests/queries/test_iterator.py

@@ -1,6 +1,7 @@
 import datetime
 from unittest import mock
 
+from django.db import connections
 from django.db.models.sql.compiler import cursor_iter
 from django.test import TestCase
 
@@ -37,3 +38,15 @@ class QuerySetIteratorTests(TestCase):
         self.assertEqual(cursor_iter_mock.call_count, 1)
         mock_args, _mock_kwargs = cursor_iter_mock.call_args
         self.assertEqual(mock_args[self.itersize_index_in_mock_args], batch_size)
+
+    def test_no_chunked_reads(self):
+        """
+        If the database backend doesn't support chunked reads, then the
+        result of SQLCompiler.execute_sql() is a list.
+        """
+        qs = Article.objects.all()
+        compiler = qs.query.get_compiler(using=qs.db)
+        features = connections[qs.db].features
+        with mock.patch.object(features, 'can_use_chunked_reads', False):
+            result = compiler.execute_sql(chunked_fetch=True)
+        self.assertIsInstance(result, list)