Fixed #35373 -- Fixed a crash when indexing a generated field on SQLite.

Generated fields have to be excluded from the INSERT query against the remade
table including the index.

Thanks Moshe Dicker for the report, David Sanders and Mariusz Felisiak for the
review.

tests/schema/tests.py

@@ -928,6 +928,39 @@ class SchemaTests(TransactionTestCase):
         self.assertEqual(obj.generated, "foo%")
         self.assertIs(obj.contains_foo, True)
 
+    @isolate_apps("schema")
+    @skipUnlessDBFeature("supports_stored_generated_columns")
+    def test_alter_generated_field(self):
+        class GeneratedFieldIndexedModel(Model):
+            number = IntegerField(default=1)
+            generated = GeneratedField(
+                expression=F("number"),
+                db_persist=True,
+                output_field=IntegerField(),
+            )
+
+            class Meta:
+                app_label = "schema"
+
+        with connection.schema_editor() as editor:
+            editor.create_model(GeneratedFieldIndexedModel)
+
+        old_field = GeneratedFieldIndexedModel._meta.get_field("generated")
+        new_field = GeneratedField(
+            expression=F("number"),
+            db_persist=True,
+            db_index=True,
+            output_field=IntegerField(),
+        )
+        new_field.contribute_to_class(GeneratedFieldIndexedModel, "generated")
+
+        with connection.schema_editor() as editor:
+            editor.alter_field(GeneratedFieldIndexedModel, old_field, new_field)
+
+        self.assertIn(
+            "generated", self.get_indexes(GeneratedFieldIndexedModel._meta.db_table)
+        )
+
     @isolate_apps("schema")
     def test_add_auto_field(self):
         class AddAutoFieldModel(Model):