#28560: distinct() on None values
-------------------------------------+-------------------------------------
               Reporter:  felixxm    |          Owner:  felixxm
                   Type:  Bug        |         Status:  assigned
              Component:  Database   |        Version:  master
  layer (models, ORM)                |
               Severity:  Normal     |       Keywords:  distinct values
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 `distinct()` doesn't work properly on `None` values. If we select columns
 with `null` values then `distinct()` returns each of them instead of
 single `None`, e.g. (based on `queries/tests.py`):

 {{{
 >>>
 list(Item.objects.filter(modified__isnull=True).values_list('modified',
 flat=True).distinct())
 [None, None, None]
 }}}

 instead of `[None]`.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/28560>
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