Comment (by Tim Graham):
I'm removing consideration of "extra" fields from the summary because
`QuerySet.extra()` is now discouraged and likely to be deprecated in the
future.
#27229 is a related ticket that suggests allowing aggregations in
`list_display`. I hope to figure out a suitable path forward for this on
the [https://groups.google.com/d/topic/django-
developers/T1-80RV8b5g/discussion django-developers mailing list] thread.
Jon, sorry you didn't get any feedback from your original work. Feel free
to chime in here if you still have time and interest in working on this.
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Ticket URL: <https://code.djangoproject.com/ticket/14336#comment:7>
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