fwiw, I struggled with this a while back and then gave up.
i ended up writing a few filter__xyz() functions that accept/return a
query. in the def, I join needed tables and filter. instead of inspecting
the query for tables, I just pass in some flags on how to act.
It's not pretty, but it works reliably and was fast to implement.
my queries now look like:
q = session.query(A).filter(A.id>10)
q = filter__as_at(q)
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