can just string all the tables together via outerjoin().
The UNION still applies if concrete tables are involved,
though (since nothing to join them on).
+ - small fix to eager loading to better work with eager loads
+ to polymorphic mappers that are using a straight "outerjoin"
+ clause
- sql
- long-identifier detection fixed to use > rather than >= for
max ident length [ticket:589]
# this example illustrates a polymorphic load of two classes, where each class has a very
# different set of properties
-metadata = BoundMetaData('sqlite://', echo='True')
+metadata = BoundMetaData('sqlite://', echo=True)
# a table to store companies
companies = Table('companies', metadata,