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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