#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) }}} -- Ticket URL: <https://code.djangoproject.com/ticket/28459#comment:34> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/068.fb92e2c52042b9aa46d327dea1d55ca7%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.