Excerpts from Bryan's message of Tue Mar 30 11:27:57 -0300 2010:
> The underlying column returns a Decimal object when queried regularly,
> and when summed as follows:
>
> select([ mytable.c.hours ])
> >>>Decimal("1.0")
> select([ func.sum(mytable.c.hours) ])
> >>>Decimal("1.0")
>
> ...but when I sum it w/ an if statement, it returns a float:
>
> select([ func.sum(func.if_(True, mytable.c.hours, 0)) ])
> >>>1.0
>
> How can I control the return type of that summed if column?
>
You could use cast [1] (example: casting to Float, untested):
from sqlalchemy.sql.expression import cast
from sqlalchemy.sa import Float
...
select([ cast(func.sum(func.if_(True, mytable.c.hours, 0)), Float)])
[1]
http://www.sqlalchemy.org/docs/reference/sqlalchemy/expressions.html#sqlalchemy.sql.expression.cast
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