Indeed, I had an attempt at doing this here (
https://github.com/django/django/pull/8928/), but it seems a hard problem.
I think there is huge potential here but I have no time to work on this
anymore.
On Tue, 17 Jul 2018, 19:00 Ramiro Morales, wrote:
> On Sat, Jun 30, 2018 at 12:40 PM Tom Forbes wrote:
>
>> Are you sure it is the prefetches that is causing this? As Adam pointed
>> out these are correctly ignored. Annotations however are not, which can
>> cause unnecessary work and longer execution times. i.e:
>>
>> Book.objects.annotate(something=Max('pages__word_count')).count()
>>
>> We have enough information to be able to strip the pages join when using
>> count() it certain conditions are met, and this might be preferable than
>> adding workarounds to various places.
>>
>
> FYI: This had already been reported in #23771 (
> https://code.djangoproject.com/ticket/23771) (and a couple of
> similar/duplicates tickets)
>
> Regards,
>
> --
> Ramiro Morales
> @ramiromorales
>
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