#36388: QuerySet.union no longer supports empty args
-------------------------------------+-------------------------------------
     Reporter:  Antoine Humeau       |                    Owner:  Colleen
                                     |  Dunlap
         Type:  Bug                  |                   Status:  assigned
    Component:  Database layer       |                  Version:  5.2
  (models, ORM)                      |
     Severity:  Release blocker      |               Resolution:
     Keywords:                       |             Triage Stage:  Accepted
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  1
Easy pickings:  0                    |                    UI/UX:  0
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Comment (by Simon Charette):

 It should point at `main` which your new PR does, thank you for that.

 Please have a look at
 [https://github.com/django/django/pull/19471#discussion_r2091852049 this
 comment]. The fact the tests are passing is not a good indicative that the
 right thing is happening here as the adjusted test I provided demonstrates
 (it does a `UNION` against itself which is not safe when `all` is used).

 I still believe that the right way of fixing this is to adjust
 `QuerySet.union` to return `self` when `not other_qs`.
-- 
Ticket URL: <https://code.djangoproject.com/ticket/36388#comment:10>
Django <https://code.djangoproject.com/>
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