#28731: Passing an empty Q() to a When inside a Case causes an OperationError
-------------------------------------+-------------------------------------
     Reporter:  Tom van Bussel       |                    Owner:  Tim
                                     |  Martin
         Type:  Bug                  |                   Status:  assigned
    Component:  Database layer       |                  Version:  1.11
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Tomer Chachamu):

 Currently `Q() | Q(value=1)` outputs the same SQL as `Q(value=1)` which
 will not be the case if `Q()` is effectively always `true`.

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Ticket URL: <https://code.djangoproject.com/ticket/28731#comment:8>
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