- session.execute() will execute a Sequence object passed to

  it (regression from 0.4).
- Removed the "raiseerror" keyword argument from object_mapper()
  and class_mapper().  These functions raise in all cases
  if the given class/instance is not mapped.
- Refined ExtensionCarrier to be itself a dict, removed
'methods' accessor
- moved identity_key tests to test/orm/utils.py
- some docstrings

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py
index 81c9d3936..8f611c05e 100644
--- a/lib/sqlalchemy/sql/expression.py
+++ b/lib/sqlalchemy/sql/expression.py
@@ -880,7 +880,10 @@ def _compound_select(keyword, *selects, **kwargs):
     return CompoundSelect(keyword, *selects, **kwargs)
 
 def _is_literal(element):
-    return not isinstance(element, (ClauseElement, Operators))
+    global schema
+    if not schema:
+        from sqlalchemy import schema
+    return not isinstance(element, (ClauseElement, Operators, schema.SchemaItem))
 
 def _from_objects(*elements, **kwargs):
     return itertools.chain(*[element._get_from_objects(**kwargs) for element in elements])