#34639: MySQL 8.0 hangs indefinitely when using the admin search with a Foreign
Key
and Annotate
--------------------------------+--------------------------------------
Reporter: Nicolas Lupien | Owner: nobody
Type: Bug | Status: closed
Component: contrib.admin | Version: 4.2
Severity: Normal | Resolution: invalid
Keywords: mysql | 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 Simon Charette):
It looks like this relates to #32682
(187118203197801c6cb72dc8b06b714b23b6dd3d).
The fact `self.root_queryset` is used without ''stripping'' unused
annotations (e.g. the `Count` one) explains why the reporter is able to
work around the issue by only annotating after the `Exists` filter is
added.
Adjusting `SQLQuery.exists` to ''strip'' used annotation (like we did with
`SQLQuery.get_aggreation` in #28477
(59bea9efd2768102fc9d3aedda469502c218e9b7)) could be a possible way to
generically optimize this problem away.
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Ticket URL: <https://code.djangoproject.com/ticket/34639#comment:5>
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