Description
Discussed in https://github.com/orgs/cycle/discussions/469
Originally posted by LLyaudet March 18, 2024
Hello,
Recently I found a problem with Django and submitted a patch in a PR:
https://code.djangoproject.com/ticket/35309
django/django#17984
I also developped a work-around for old versions of Django:
https://github.com/LLyaudet/django-monkey-patches/blob/main/src/django_monkey_patches/django__orm__prefetch_without_useless_order_by.py
I don't know yet Cycle ORM details.
The idea is just that some models can have a default ordering (I assume this functionality is present in Cycle ORM also).
And that some ORM may still add this ordering in the SQL query whilst it is not needed because only a single object will be prefetched per instance of the original result set.
On very big prefetches I noticed a gain of 10 - 15 %,
since the rest of the DB query is mainly an index scan.
#ClimateChangeBrake
Can someone please dump the queries of such prefetches and see if the bug is present in Cycle ORM ?
If so submitting a PR should not be too hard.
I will try to help.
But right now, I start by warning the frameworks/ORM I am aware of :)
Best regards,
Laurent Lyaudet
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