SAWarning: The IN-predicate on "stack_tag.tag" was invoked with an empty sequence.

[Angus Salkeld]

I am getting this when Heat starts:

/usr/lib/python2.7/dist-packages/sqlalchemy/sql/default_comparator.py:35: SAWarning: The IN-predicate on "stack_tag.tag" was invoked with an empty sequence. This results in a contradiction, which nonetheless can be expensive to evaluate. Consider alternative strategies for improved performance.
  return o[0](self, self.expr, op, *(other + o[1:]), **kwargs)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/175436

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/175436
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=bf36f88fad0c13c217c6dd29a946f33eb112e6be
Submitter: Jenkins
Branch: master

commit bf36f88fad0c13c217c6dd29a946f33eb112e6be
Author: Sergey Kraynev <email address hidden>
Date: Mon Apr 20 10:56:24 2015 -0400

    Do not filter stacks if tags is empty list

    Change-Id: I3dd55881800ef45605e4c2c77d06a2c5fe2b0ee4
    Closes-Bug: #1446044