Hi,

I have an instance of sqlalchemy.sql.selectable.Exists which I got as the 
whereclause of a query generated by Query.any().

I would like to inspect the nested SELECT statement in such a way that I can 
get hold of its whereclause and column_descriptions.

Unfortunately, I think the EXISTS clause got already compiled to a Selectable 
and thus I cannot inspect it like I can the uncompiled query.

Any hints on how to achieve that?

Cheers,
Nik

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