How can I use GLOBAL IN in this module?

I was using sqlachemy to do a Double-distributed IN/JOIN subqueries, whose sql looks like
`SELECT *
FROM table_a
WHERE
field_a global in (
SELECT filed_a FROM table b
)`
The sql works well. But in order to keep the code clean, I need write it in ORM way, like
`query(cls.field_a.in(table_b.subquery())`
I can't find where to put the keyword **_global_** in. So I just got the exception
` Double-distributed IN/JOIN subqueries is denied (distributed_product_mode = 'deny').`
Is there any one knows how to solve this?