I seem to have solved it by aliasing the first instance too
                query = sqlalchemy.orm.query(Xxx)
                *alias = SA.orm.aliased(Xxx)*
                query = query.join(*(alias,'parent')*, aliased=True)
                query = query.filter(<some criterion>)      

But this basically succeeded "by magic" when I just tried all sorts of 
stuff.
I can't really understand why an addition of an alias caused the SQL not 
have an additional alias.

Is there a place in the doc that explains this?
I don't feel safe with these "magical" solutions, they tend to break on SA 
upgrades.


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