Hello!

In a configuration looking like this:
class Parent:
   pass

class Child(Parent):
   pass

class ChildChild(Child):
   pass

I would like to query the Childs and all classes that inherits it
(here: ChildChild), but not Parent instances.
session.query(Child).all() returns Child type only ( SQL : "WHERE type
IN (2)" ), and I'd like to avoid to manually list the classes that
inherit Child class.

Thanks

GustaV
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