#30188: Aggregate annotation, Case() - When(): AssertionError No exception 
message
supplied
-------------------------------------+-------------------------------------
     Reporter:  Lukas Klement        |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  2.1
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  query, aggregate,    |             Triage Stage:  Accepted
  case/when                          |
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  1
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

 Can, I guess we could somehow but I feel like we'd need a more elegant
 solution than that.

 Note that the double annotation issue doesn't only happen for subqueries,
 you might have noticed that the `company_id` which is first annotated as
 `Col0` gets annotated as `__col0` as well. This makes me believe we might
 need to do it for `Col` instances as well?

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30188#comment:20>
Django <https://code.djangoproject.com/>
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