#28781: Order of queryset.union() with queryset.values() is incorrect
-------------------------------------+-------------------------------------
Reporter: Amir Aziiev | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.11
(models, ORM) |
Severity: Normal | Resolution:
Keywords: union, values | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by Amir Aziiev:
Old description:
> For example:
>
> {{{
> from django.db import models
>
> class MyModel(models.Model):
> col1 = models.CharField(max_length=11)
> col2 = models.CharField(max_length=22)
> col3 = models.CharField(max_length=33)
>
> qs = MyModel.objects.union(MyModel.objects.all(),
> all=True).values('col2', 'col3', 'col1', 'id').order_by('col1')
> print(qs.query)
> # Expected SQL
> """
> (SELECT "mymodel"."id", "mymodel"."col1", "mymodel"."col2",
> "mymodel"."col3" FROM "mymodel")
> UNION ALL
> (SELECT"mymodel"." id", "mymodel"."col1", "mymodel"."col2",
> "mymodel"."col3" FROM "mymodel")
> ORDER BY (3);
> ------------^
> """
> # Must be SQL
> """
> (SELECT "mymodel"."id", "mymodel"."col1", "mymodel"."col2",
> "mymodel"."col3" FROM "mymodel")
> UNION ALL
> (SELECT"mymodel"." id", "mymodel"."col1", "mymodel"."col2",
> "mymodel"."col3" FROM "mymodel")
> ORDER BY (2);
> ------------^
> }}}
New description:
For example:
{{{
from django.db import models
class MyModel(models.Model):
col1 = models.CharField(max_length=11)
col2 = models.CharField(max_length=22)
col3 = models.CharField(max_length=33)
qs = MyModel.objects.union(MyModel.objects.all(), all=True).values('col2',
'col3', 'col1', 'id').order_by('col1')
print(qs.query)
# Expected SQL
"""
(SELECT "mymodel"."id", "mymodel"."col1", "mymodel"."col2",
"mymodel"."col3" FROM "mymodel")
UNION ALL
(SELECT"mymodel"." id", "mymodel"."col1", "mymodel"."col2",
"mymodel"."col3" FROM "mymodel")
ORDER BY (3);
------------^
"""
# Must be SQL
"""
(SELECT "mymodel"."id", "mymodel"."col1", "mymodel"."col2",
"mymodel"."col3" FROM "mymodel")
UNION ALL
(SELECT"mymodel"." id", "mymodel"."col1", "mymodel"."col2",
"mymodel"."col3" FROM "mymodel")
ORDER BY (2);
------------^
"""
}}}
--
--
Ticket URL: <https://code.djangoproject.com/ticket/28781#comment:2>
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