#34597: Queryset (split) exclude's usage of Exists is significantly slower than
subquery
-------------------------------------+-------------------------------------
Reporter: Lorand Varga | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: 3.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by David Sanders):
> but the reporter said that they were also getting poor results with the
provided ORM examples that explicitly don't have this criteria (e.g.
`~Exists(Blog.objects.filter(translation=None, id=OuterRef("id"))`)
Interesting I tried that and the plan was better, though I don't have any
data to work with.
Am eager to hear what the results are.
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Ticket URL: <https://code.djangoproject.com/ticket/34597#comment:8>
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