#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/9542 PR (Improved performance of duration expressions on SQLite)] Before: {{{ %timeit for x in Date.objects.annotate(d=models.ExpressionWrapper(models.F('date') + models.F('duration'), models.DateTimeField())).values_list('d'): pass 591 ms ± 21.8 ms per loop (mean ± std. dev. of 7 runs, 1 loop each) }}} After: {{{ %timeit for x in Date.objects.annotate(d=models.ExpressionWrapper(models.F('date') + models.F('duration'), models.DateTimeField())).values_list('d'): pass 390 ms ± 2.4 ms per loop (mean ± std. dev. of 7 runs, 1 loop each) }}} -- Ticket URL: <https://code.djangoproject.com/ticket/28459#comment:32> 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/068.0ec6784e8310b5893776f2eae64d502a%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.