Fixed #33759 -- Avoided unnecessary subquery in QuerySet.delete() with self-referential subqueries if supported.

django/db/backends/base/features.py

@@ -12,6 +12,9 @@ class BaseDatabaseFeatures:
     allows_group_by_select_index = True
     empty_fetchmany_value = []
     update_can_self_select = True
+    # Does the backend support self-reference subqueries in the DELETE
+    # statement?
+    delete_can_self_reference_subquery = True
 
     # Does the backend distinguish between '' and None?
     interprets_empty_strings_as_nulls = False

django/db/backends/mysql/features.py

@@ -24,6 +24,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_slicing_ordering_in_compound = True
     supports_index_on_text_field = False
     supports_update_conflicts = True
+    delete_can_self_reference_subquery = False
     create_test_procedure_without_params_sql = """
         CREATE PROCEDURE test_procedure ()
         BEGIN

django/db/models/sql/compiler.py

@@ -1890,7 +1890,10 @@ class SQLDeleteCompiler(SQLCompiler):
         Create the SQL for this query. Return the SQL string and list of
         parameters.
         """
-        if self.single_alias and not self.contains_self_reference_subquery:
+        if self.single_alias and (
+            self.connection.features.delete_can_self_reference_subquery
+            or not self.contains_self_reference_subquery
+        ):
             return self._as_sql(self.query)
         innerq = self.query.clone()
         innerq.__class__ = Query