Fixed django#373 - Fix relabaleing

django/db/models/expressions.py

@@ -1313,7 +1313,7 @@ def get_source_expressions(self):
     def set_source_expressions(self, exprs):
         assert all(isinstance(expr, Col) for expr in exprs)
         self.targets = [col.target for col in exprs]
-        self.sources = [col.output_field for col in exprs]
+        self.sources = [col.field for col in exprs]
 
     def as_sql(self, compiler, connection):
         cols_sql = []
@@ -1327,15 +1327,18 @@ def as_sql(self, compiler, connection):
 
         return ", ".join(cols_sql), cols_params
 
-    @staticmethod
-    def db_converter(value, *_):
-        return (tuple(value),)
-
     def relabeled_clone(self, relabels):
         return self.__class__(
             relabels.get(self.alias, self.alias), self.targets, self.sources, self.field
         )
 
+    def resolve_expression(self, *args, **kwargs):
+        return self
+
+    @staticmethod
+    def db_converter(value, *_):
+        return (tuple(value),)
+
 
 class Ref(Expression):
     """