Merge branch 'ticket_2587'

Conflicts:
	test/profiles.txt
	test/sql/test_selectable.py

1 files changed, 9 insertions, 2 deletions

diff --git a/lib/sqlalchemy/sql/visitors.py b/lib/sqlalchemy/sql/visitors.py
index 62f46ab64..c5a45ffd4 100644
--- a/lib/sqlalchemy/sql/visitors.py
+++ b/lib/sqlalchemy/sql/visitors.py
@@ -30,6 +30,7 @@ import operator
 __all__ = ['VisitableType', 'Visitable', 'ClauseVisitor',
     'CloningVisitor', 'ReplacingCloningVisitor', 'iterate',
     'iterate_depthfirst', 'traverse_using', 'traverse',
+    'traverse_depthfirst',
     'cloned_traverse', 'replacement_traverse']
 
 
@@ -255,7 +256,11 @@ def cloned_traverse(obj, opts, visitors):
     """clone the given expression structure, allowing
     modifications by visitors."""
 
-    cloned = util.column_dict()
+
+    if "cloned" in opts:
+        cloned = opts['cloned']
+    else:
+        cloned = util.column_dict()
     stop_on = util.column_set(opts.get('stop_on', []))
 
     def clone(elem):
@@ -281,10 +286,12 @@ def replacement_traverse(obj, opts, replace):
 
     cloned = util.column_dict()
     stop_on = util.column_set([id(x) for x in opts.get('stop_on', [])])
+    unconditional = opts.get('unconditional', False)
 
     def clone(elem, **kw):
         if id(elem) in stop_on or \
-            'no_replacement_traverse' in elem._annotations:
+            (not unconditional
+                    and 'no_replacement_traverse' in elem._annotations):
             return elem
         else:
             newelem = replace(elem)