Oracle to_date broken when using SQL generation in beta5

Here's another simple testcase that fails for Oracle beta5 but works with 0.3.7. It's about the simplest query I can come up with. Have a table with a date column in it and query against it using the "to_date" function.

def test_to_date():
   start_date = '10/05/04'
   where = cal_dim.c.adwkenddt == func.to_date(start_date,'MM/DD/RR')

   query = select([cal_dim.c.adwkenddt](cal_dim.c.adwkenddt),
                  whereclause=where
                  )

   result = query.execute()
   for r in result:
       print r

This fails for beta5, works for .3.7. The error is::

Traceback (most recent call last):
 File "s4.py", line 88, in ?
   test_to_date()
 File "s4.py", line 59, in test_to_date
   result = query.execute()
 File "/home/matt/work/vpython/lib/python2.4/site-packages/SQLAlchemy-0.4.0beta5-py2.4.egg/sqlalchemy/sql/expression.py",
line 973, in execute
   return compiled.execute(*multiparams, **params)
 File "/home/matt/work/vpython/lib/python2.4/site-packages/SQLAlchemy-0.4.0beta5-py2.4.egg/sqlalchemy/engine/base.py",
line 488, in execute
   return e._execute_compiled(self, multiparams, params)
 File "/home/matt/work/vpython/lib/python2.4/site-packages/SQLAlchemy-0.4.0beta5-py2.4.egg/sqlalchemy/engine/base.py",
line 1121, in _execute_compiled
   return connection._execute_compiled(compiled, multiparams, params)
 File "/home/matt/work/vpython/lib/python2.4/site-packages/SQLAlchemy-0.4.0beta5-py2.4.egg/sqlalchemy/engine/base.py",
line 832, in _execute_compiled
   self.__execute_raw(context)
 File "/home/matt/work/vpython/lib/python2.4/site-packages/SQLAlchemy-0.4.0beta5-py2.4.egg/sqlalchemy/engine/base.py",
line 850, in __execute_raw
   self._cursor_execute(context.cursor, context.statement,
parameters, context=context)
 File "/home/matt/work/vpython/lib/python2.4/site-packages/SQLAlchemy-0.4.0beta5-py2.4.egg/sqlalchemy/engine/base.py",
line 867, in _cursor_execute
   raise exceptions.DBAPIError.instance(statement, parameters, e)
sqlalchemy.exceptions.DatabaseError: (DatabaseError) ORA-00932:
inconsistent datatypes: expected NUMBER got CLOB
 'SELECT "AD_WEEK_CALENDAR_DIM".adwkenddt \nFROM
"AD_WEEK_CALENDAR_DIM" \nWHERE "AD_WEEK_CALENDAR_DIM".adwkenddt =
to_date(:to_date, :to_date_1)' {'to_date_1': 'MM/DD/RR', 'to_date':
'10/05/04'}

Am still confused as to the problem here.... I run the same query through text and it works::

def test_to_date_text():
   s = text("""SELECT "AD_WEEK_CALENDAR_DIM".adwkenddt
   FROM "AD_WEEK_CALENDAR_DIM"
   WHERE "AD_WEEK_CALENDAR_DIM".adwkenddt = to_date(:to_date, :to_date_1)""")
   result = connection.execute(s,
                               to_date_1= 'MM/DD/RR',
                               to_date= '10/05/04')

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