return type of exists() is boolean, duh

diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py
index f7fc5f9617cb314846ad550ac352adaed2a96902..57770ef42ebb822e3ceb035bb16f5ca8117adc85 100644 (file)
--- a/lib/sqlalchemy/sql/expression.py
+++ b/lib/sqlalchemy/sql/expression.py
@@ -2278,7 +2278,7 @@ class _Exists(_UnaryExpression):
                 args = ([literal_column('*')],)
             s = select(*args, **kwargs).as_scalar().self_group()
             
-        _UnaryExpression.__init__(self, s, operator=operators.exists)
+        _UnaryExpression.__init__(self, s, operator=operators.exists, type_=sqltypes.Boolean)
 
     def select(self, whereclause=None, **params):
         return select([self], whereclause, **params)