#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/9486 PR]
Before:
{{{
In [2]: %timeit for x in DecimalModel.objects.values_list('d'): pass
128 ms ± 531 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
In [3]: %timeit for x in DecimalModel.objects.values_list(models.F('d') +
1): pass
39.5 ms ± 542 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}
After:
{{{
In [2]: %timeit for x in DecimalModel.objects.values_list('d'): pass
31.8 ms ± 490 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
In [3]: %timeit for x in DecimalModel.objects.values_list(models.F('d') +
1): pass
20.3 ms ± 579 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:26>
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