James E. Blair 0f0b1b149a Speed up loading a change with eager loading
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
2016-07-18 16:42:13 -07:00
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