#30000: QuerySet constructed with .union() should raise an exception on 
filter() attempt.
     Reporter:  thoha                |                    Owner:  Hasan
                                     |  Ramezani
         Type:  Bug                  |                   Status:  assigned
    Component:  Database layer       |                  Version:  1.11
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  queryset union       |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0

Comment (by thoha):

 Replying to [comment:7 Hasan Ramezani]:
 > should we raise an exception for all `filter()` attempts? or just for
 unsupported one?
 > if we should we raise an exception just for unsupported, is there any
 way to find them?

 Unsupported ones, I'd think. For my original problem, a simple check would
 be to do a count on the number of selections made in the form and
 comparing that to the number of records returned - normally they should

Ticket URL: <https://code.djangoproject.com/ticket/30000#comment:8>
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