#34450: Lookup expressions across foreign keys introduce extra joins
-------------------------------------+-------------------------------------
Reporter: Roman Odaisky | Owner: Simon
| Charette
Type: Bug | Status: assigned
Component: Database layer | Version: 4.1
(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
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Comment (by David Sanders):
Oh and it also raises the question of whether
{{{
Parent.objects.filter(Exact(F("child__x"), "x")
}}}
should be demoted (produce an inner join) because at the moment
`build_filter()` doesn't attempt to find any "needed inners" thus
`_add_q()` doesn't have anything to try to demote to.
🙂
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Ticket URL: <https://code.djangoproject.com/ticket/34450#comment:9>
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