seems something about .type vs .type_ or similar:
Traceback (most recent call last):
File "tests/convertertest.py", line 152, in
test4_balance_trans_via_prev_balance_date_subselect
trans.c.date > func.coalesce( sprev,0 )
File "sqlalchemy/sql/expression.py", line 777, in __call__
return func(*c, **o)
File "sqlalchemy/sql/functions.py", line 12, in __call__
return type.__call__(self, *args, **kwargs)
File "sqlalchemy/sql/functions.py", line 35, in __init__
kwargs.setdefault('type_', _type_from_args(args))
File "sqlalchemy/sql/functions.py", line 75, in _type_from_args
if not isinstance(a.type, sqltypes.NullType):
AttributeError: 'Select' object has no attribute 'type'
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