skip some len calls

diff --git a/lib/sqlalchemy/schema.py b/lib/sqlalchemy/schema.py
index 67f37e76398c816eb1f91329e37a139365b63d4c..4eff82333371aafc59ef56fc6272502c1f840215 100644 (file)
--- a/lib/sqlalchemy/schema.py
+++ b/lib/sqlalchemy/schema.py
@@ -1598,7 +1598,7 @@ class ColumnCollectionConstraint(Constraint):
         return (ordered_dict[key] for key in ordered_dict._list)
 
     def __len__(self):
-        return len(self.columns)
+        return len(self.columns._data)
 
 
 class CheckConstraint(Constraint):