#34267: QuerySet.union() crashes with IndexError when getting cached results.
-------------------------------------+-------------------------------------
Reporter: Raphaël Stefanini | Owner: Francesco
| Panico
Type: Bug | Status: assigned
Component: Database layer | Version: 4.2
(models, ORM) |
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Simon Charette):
It seems that the issue is likely due the
[https://github.com/django/django/commit/3d734c09ff0138441dfe0a59010435871d17950f
#diff-
f58de2deaccecd2d53199c5ca29e3e1050ec2adb80fb057cdfc0b4e6accdf14fR547-R551
if sliced] branch which was hoping to port the optimization that made
`union().exists()` have all the involved subqueries augmented with `LIMIT
1` if supported by the backend.
I believe that this optimization can likely be removed since backends are
likely smart enough to perform this optimization themselves when `EXISTS`
is used.
--
Ticket URL: <https://code.djangoproject.com/ticket/34267#comment:5>
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