From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sat, 18 Aug 2012 05:03:31 +0000 (-0400)
Subject: - aaaaand fix one more glitch I just thought of
X-Git-Tag: rel_0_8_0b1~229
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=824bd661588d6715d56f279494f98046215b394c;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

- aaaaand fix one more glitch I just thought of
---

diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py
index e8905ccec5..969a6920b2 100644
--- a/lib/sqlalchemy/sql/expression.py
+++ b/lib/sqlalchemy/sql/expression.py
@@ -1586,6 +1586,7 @@ class ClauseElement(Visitable):
         c = self.__class__.__new__(self.__class__)
         c.__dict__ = self.__dict__.copy()
         c.__dict__.pop('_cloned_set', None)
+        c.__dict__.pop('comparator', None)
 
         # this is a marker that helps to "equate" clauses to each other
         # when a Select returns its list of FROM clauses.  the cloning
diff --git a/test/sql/test_selectable.py b/test/sql/test_selectable.py
index 045f6695c3..b81bd8e6fe 100644
--- a/test/sql/test_selectable.py
+++ b/test/sql/test_selectable.py
@@ -1,7 +1,7 @@
 """Test various algorithmic properties of selectables."""
 
 from test.lib.testing import eq_, assert_raises, \
-    assert_raises_message
+    assert_raises_message, is_
 from sqlalchemy import *
 from test.lib import *
 from sqlalchemy.sql import util as sql_util, visitors
@@ -348,6 +348,14 @@ class SelectableTest(fixtures.TestBase, AssertsExecutionResults, AssertsCompiled
         criterion = a.c.table1_col1 == table2.c.col2
         self.assert_(criterion.compare(j.onclause))
 
+    def test_scalar_cloned_comparator(self):
+        sel = select([table1.c.col1]).as_scalar()
+        expr = sel == table1.c.col1
+
+        sel2 = visitors.ReplacingCloningVisitor().traverse(sel)
+
+        expr2 = sel2 == table1.c.col1
+        is_(expr2.left, sel2)
 
     def test_column_labels(self):
         a = select([table1.c.col1.label('acol1'),