> I would normally do session.query(Foo).count()
COUNT is somewhat expensive compared to just checking whether rows exist,
especially if lots of rows match (2.2M rows in the example):
In : %timeit -n1 -r1 EventPerson.query.count()
1 loop, best of 1: 135 ms per loop
In : %timeit -n1 -r1
1 loop, best of 1: 2.44 ms per loop
> how does this interact with filtering etc?
It keeps all the filters present on the query object (in that example,
`self` is the existing query object)
> this query is against column expressions, not entities, so eager loading
is not involved.
That's what I first thought, but the related OUTER JOINs are still added.
Maybe a bug?
The Python SQL Toolkit and Object Relational Mapper
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