Mike Bayer avatar Mike Bayer committed c49d58e

this step is not needed

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lib/sqlalchemy/ext/declarative/base.py

     mapper_args_fn = None
     table_args = inherited_table_args = None
     tablename = None
-    parent_columns = ()
 
     declarative_props = (declared_attr, util.classproperty)
 
                 return
 
         class_mapped = _declared_mapping_info(base) is not None
-        if class_mapped:
-            parent_columns = base.__table__.c.keys()
 
         for name, obj in vars(base).items():
             if name == '__mapper_args__':
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