zzzeek/sqlalchemy — pull request #57 by sdague (2014-01-12 04:13:22+00:00)
Title: expose SchemaVisitor in the compatibility layer

sqlalchemy-migrate uses SchemaVisitor. It was one of the only
objects that changed namespaces without compatibility that we use.

Would love to get this added to remove a work around we need at
https://review.openstack.org/#/c/66156/