Boolean test on queryset

When one tests for the boolean value of a queryset in the following way:

examples = Example.objects.all()

if examples:
    ..... do something


You might think (I did) that Django will call a __nonzero__ special attribute that would either execute an EXISTS SQL STATEMENT or a SELECT statement with a LIMIT of 1.  Instead, the ORM evaluates the entire queryset through the __len__ attribute.

Is there a best practice for working around this?

Thanks,

Adam

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