#29317: filter keyword undocumented in PostgreSQL aggregate functions
-------------------------------------+-------------------------------------
     Reporter:  Matthew Pava         |                    Owner:  nobody
         Type:                       |                   Status:  new
  Cleanup/optimization               |
    Component:  Documentation        |                  Version:
     Severity:  Normal               |               Resolution:
     Keywords:  aggregate            |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
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Comment (by Matthew Pava):

 I agree.  I just found the documentation here:
 https://docs.djangoproject.com/en/2.0/topics/db/aggregation/#filtering-on-
 annotations
 Honestly, though, even that little note seems a little buried in
 everything.

 Maybe we can add a link to the generic aggregation documentation on the
 PostgreSQL aggregation documentation?
 And, I think I found a bug.  I keep getting this error when using a filter
 `Q` object with `ArrayAgg`:
 `AttributeError: 'WhereNode' object has no attribute
 '_output_field_or_none'`

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29317#comment:2>
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