- unfortunately we need to match within join where col.key does not match

what's given so we need to use a set() here.  contains_column is not within
any performance paths

diff --git a/lib/sqlalchemy/sql/base.py b/lib/sqlalchemy/sql/base.py
index 48b9a8a2b0b345a95a4d2912afe59f10e0ac3832..97fb04dd92db0de8d8ba214d346aef8ed86cbacf 100644 (file)
--- a/lib/sqlalchemy/sql/base.py
+++ b/lib/sqlalchemy/sql/base.py
@@ -579,8 +579,7 @@ class ColumnCollection(util.OrderedProperties):
         object.__setattr__(self, '_all_columns', state['_all_columns'])
 
     def contains_column(self, col):
-        existing = self._data.get(col.key)
-        return existing is not None and hash(existing) == hash(col)
+        return col in set(self._all_columns)
 
     def as_immutable(self):
         return ImmutableColumnCollection(self._data, self._all_columns)