#30685: Optimize QuerySet.count() with distinct() or annotate().
-------------------------------------+-------------------------------------
Reporter: Adam Sołtysik | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: 2.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
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 Adam Sołtysik):
Actually, wouldn't it be as simple as adding these two lines after `obj =
self.clone()` here:
https://github.com/django/django/blob/05964b2198e53a8d66e34d83d9123e3051720b28/django/db/models/sql/query.py#L505-L514
{{{
obj.set_values(['pk'])
obj.clear_ordering(force_empty=True)
}}}
I tried it and it seems to be working (didn't run tests, though). But I
think I don't understand the second part of Simon's advice.
--
Ticket URL: <https://code.djangoproject.com/ticket/30685#comment:8>
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