#28459: Improve performance of QuerySet
-------------------------------------+-------------------------------------
Reporter: Sergey Fedoseev | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Sergey Fedoseev):
[https://github.com/django/django/pull/9739 PR (Improved performance of
time difference expressions on MySQL)]
Before:
{{{
%timeit
bool(TestModel.objects.values_list(models.ExpressionWrapper(models.F('time')
- models.F('time'), output_field=models.DurationField())))
35.4 ms ± 901 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}
After:
{{{
%timeit
bool(TestModel.objects.values_list(models.ExpressionWrapper(models.F('time')
- models.F('time'), output_field=models.DurationField())))
30 ms ± 810 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/28459#comment:34>
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