On Sat, Jun 30, 2018 at 12:40 PM Tom Forbes <t...@tomforb.es> 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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