
To display a change screen, we need to access all of the revisions, files, and comments for the change. Tell SQLAlchemy in that case to go ahead and load everything in one query. In local testing, this made https://review.openstack.org/223333 load in about 1 second rather than 9 seconds. Change-Id: I5eb53e2a1ee853f4489e92c4ca719cfb96b4a563