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[wangxiyuan <wangxiyuan@xxxxxxxxxx>]

Public bug reported:


When create a image without data via api v2.0.

It will raise a warning like:
SAWarning: The IN-predicate on "image_locations.id" was invoked with an empty sequence. This results in a contradiction, which nonetheless can be expensive to evaluate.  Consider alternative strategies for improved performance.

from the code:
https://github.com/openstack/glance/blob/master/glance/db/sqlalchemy/api.py#L798

The reason is that 'location_data' 's value  is [], not None. So the
function '_image_locations_set' will be always  executed.

** Affects: glance
     Importance: Undecided
     Assignee: wangxiyuan (wangxiyuan)
         Status: New

** Changed in: glance
     Assignee: (unassigned) => wangxiyuan (wangxiyuan)

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https://bugs.launchpad.net/bugs/1471080

Title:
  Unexpected warning when create image without data

Status in OpenStack Image Registry and Delivery Service (Glance):
  New

Bug description:
  
  When create a image without data via api v2.0.

  It will raise a warning like:
  SAWarning: The IN-predicate on "image_locations.id" was invoked with an empty sequence. This results in a contradiction, which nonetheless can be expensive to evaluate.  Consider alternative strategies for improved performance.

  from the code:
  https://github.com/openstack/glance/blob/master/glance/db/sqlalchemy/api.py#L798

  The reason is that 'location_data' 's value  is [], not None. So the
  function '_image_locations_set' will be always  executed.

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