remove unused set

diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index 9a4fd68cb13d17ce0c6139135ac4a2e36f80f777..57c29a6308a1429825bb01c11a7c285d14c38c9f 100644 (file)
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -759,7 +759,6 @@ class Mapper(object):
         updated_objects = util.Set()
         
         table_to_mapper = {}
-        tables = util.Set()
         for mapper in self.polymorphic_iterator():
             for t in mapper.tables:
                 table_to_mapper.setdefault(t, mapper)