Fixed DatabaseFeatures.supports_index_column_ordering and related tests with MyISAM storage engine.

django/db/backends/mysql/features.py

@@ -328,6 +328,8 @@ class DatabaseFeatures(BaseDatabaseFeatures):
 
     @cached_property
     def supports_index_column_ordering(self):
+        if self._mysql_storage_engine != "InnoDB":
+            return False
         if self.connection.mysql_is_mariadb:
             return self.connection.mysql_version >= (10, 8)
         return self.connection.mysql_version >= (8, 0, 1)

django/db/models/indexes.py

@@ -111,6 +111,10 @@ class Index:
                 for field_name, _ in self.fields_orders
             ]
             col_suffixes = [order[1] for order in self.fields_orders]
+            if schema_editor.connection.features.supports_index_column_ordering:
+                col_suffixes = [order[1] for order in self.fields_orders]
+            else:
+                col_suffixes = [""] * len(self.fields_orders)
             expressions = None
         return schema_editor._create_index_sql(
             model,

tests/indexes/tests.py

@@ -93,6 +93,7 @@ class SchemaIndexesTests(TestCase):
             str(index.create_sql(Article, editor)),
         )
 
+    @skipUnlessDBFeature("supports_index_column_ordering")
     def test_descending_columns_list_sql(self):
         index = Index(fields=["-headline"], name="whitespace_idx")
         editor = connection.schema_editor()