Removed DatabaseFeatures.can_combine_inserts_with_and_without_auto_increment_pk.

Unused (always False) after 29132ebdef.

django/db/backends/base/features.py

@@ -28,7 +28,6 @@ class BaseDatabaseFeatures(object):
     has_bulk_insert = False
     uses_savepoints = False
     can_release_savepoints = False
-    can_combine_inserts_with_and_without_auto_increment_pk = False
 
     # If True, don't use integer foreign keys referring to, e.g., positive
     # integer primary keys.

django/db/backends/sqlite3/features.py

@@ -25,7 +25,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_1000_query_parameters = False
     supports_mixed_date_datetime_comparisons = False
     has_bulk_insert = True
-    can_combine_inserts_with_and_without_auto_increment_pk = False
     supports_foreign_keys = False
     supports_column_check_constraints = False
     autocommits_when_autocommit_is_off = True

django/db/models/query.py

@@ -440,10 +440,6 @@ class QuerySet(object):
         objs = list(objs)
         self._populate_pk_values(objs)
         with transaction.atomic(using=self.db, savepoint=False):
-            if (connection.features.can_combine_inserts_with_and_without_auto_increment_pk and
-                    self.model._meta.has_auto_field):
-                self._batched_insert(objs, fields, batch_size)
-            else:
             objs_with_pk, objs_without_pk = partition(lambda o: o.pk is None, objs)
             if objs_with_pk:
                 self._batched_insert(objs_with_pk, fields, batch_size)