#28553: Querysets: annotate() columns are forced into a certain position which
may
disrupt union()
-------------------------------------+-------------------------------------
Reporter: David Sanders | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.11
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Ole Laursen):
* cc: Ole Laursen (added)
* type: Cleanup/optimization => Bug
Comment:
There's a ticket with a test case in #30211.
That ticket was reported as a bug, and I think this ticket should be a bug
too, so I'm changing the classification for now (apologies if that's
inappropriate). I think it's a bug because the documentation in my reading
implies that as long as the columns match, union will work. So it really
comes as a bit of a surprise that Django overrides the order in
values_list().
In my particular case, I'm using union() to combine two different tables
that I need to get out in sorted order, and I was trying to use annotate()
+ values_list() to add a NULL filler to one table as it lacks a column
from the other.
Also, I suppose the ORM could possibly also be a bit more efficient if it
could return values_list() tuples directly from the select instead of
having to rearrange them?
--
Ticket URL: <https://code.djangoproject.com/ticket/28553#comment:4>
Django <https://code.djangoproject.com/>
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