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-rw-r--r--lib/sqlalchemy/orm/loading.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/loading.py b/lib/sqlalchemy/orm/loading.py
index 1fe924d96..dad1f1a0a 100644
--- a/lib/sqlalchemy/orm/loading.py
+++ b/lib/sqlalchemy/orm/loading.py
@@ -329,7 +329,7 @@ def instance_processor(mapper, context, path, adapter,
if mapper.allow_partial_pks:
is_not_primary_key = _none_set.issuperset
else:
- is_not_primary_key = _none_set.issubset
+ is_not_primary_key = _none_set.intersection
def _instance(row, result):
if not new_populators and invoke_all_eagers: