#35947: prefetch_related makes duplicate queries for the same records by
different
relations
-------------------------------------+-------------------------------------
Reporter: Jake Douglas | Owner: (none)
Type: | Status: closed
Cleanup/optimization |
Component: Database layer | Version: 5.1
(models, ORM) |
Severity: Normal | Resolution: wontfix
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Jake Douglas):
The example code I provided is not from our application, it's just a
simplification that demonstrates the behavior. Most occurrences of
duplicate prefetch queries in our application do not involve denormalized
relations.
The quoted query stats ''are'' from a request in our application and were
intended to demonstrate that this behavior is not rare, but I realize the
greater context is missing: almost all of the duplicate queries are coming
from `prefetch_related`, with some queries being issued 20+ times for the
most commonly prefetched relations in this request.
--
Ticket URL: <https://code.djangoproject.com/ticket/35947#comment:4>
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