Is there any shorter/prettier way for this?
session.query(session.query(Foo).exists()).scalar()
It's not hard to add a custom method to the base query class that returns
self.session.query(self.exists()).scalar()
but it feels like something that should be part of SQLAlchemy.
Also, is there any case where `.enable_eagerloads(False)` right before
`.exists()` could cause problems / different results?
If not, wouldn't it make sense for exists() to do that automatically?
Loading a relationship doesn't ever seem to make sense
when checking exists().
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