#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 Tim Graham <timograham@…>):

 In [changeset:"35431298226165986ad07e91f9d3aca721ff38ec" 35431298]:
 {{{
 #!CommitTicketReference repository=""
 revision="35431298226165986ad07e91f9d3aca721ff38ec"
 Refs #27149 -- Moved subquery expression resolving to Query.

 This makes Subquery a thin wrapper over Query and makes sure it respects
 the Expression source expression API by accepting the same number of
 expressions as it returns. Refs #30188.

 It also makes OuterRef usable in Query without Subquery wrapping. This
 should allow Query's internals to more easily perform subquery push downs
 during split_exclude(). Refs #21703.
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30188#comment:23>
Django <https://code.djangoproject.com/>
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