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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