#30246: Using an annotated field calculated with 
django.db.models.functions.Extract
in aggregate results in ProgrammingError
-------------------------------------+-------------------------------------
     Reporter:  Jan BaryƂa           |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  2.1
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  query, aggregate,    |             Triage Stage:  Accepted
  extract, annotate, postgresql      |
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

 Alright so I confirmed the bug lies in `rewrite_cols` handling of
 `Lookup`; it should operate on ''clones'' of `expr` and not `expr`
 directly as they cause a rewrite of previous annotations `Col`. In the
 provided example here the missing `"__col2"` is actually the inner query's
 `EXTRACT` reference to `friday_night_closing` that gets rewritten to
 `Ref('__col2')` on the first call to `rewrite_cols`.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30246#comment:4>
Django <https://code.djangoproject.com/>
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