#30374: Paginator UnorderedObjectListWarning on union(all=True) of two sorted
queries
-------------------------------------+-------------------------------------
Reporter: Rich Rauenzahn | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution: invalid
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 Rich Rauenzahn):
...Actually. I could have sworn I read somewhere that union(all=True)
preserves order because it doesn't remove duplicates, but I can't find it
again.
Postgres says:
> UNION effectively appends the result of query2 to the result of query1
(although there is no guarantee that this is the order in which the rows
are actually returned).
> Furthermore, it eliminates duplicate rows from its result, in the same
way as DISTINCT, unless UNION ALL is used.
In practice it appears to be true, but I don't think it's strictly defined
in the spec.
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Ticket URL: <https://code.djangoproject.com/ticket/30374#comment:4>
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