#30209: Union with group by don't generate correct Subquery
-------------------------------------+-------------------------------------
Reporter: Nikolas | Owner: nobody
Type: | Status: new
Uncategorized |
Component: Database | Version: 1.11
layer (models, ORM) |
Severity: Normal | Keywords: union, group by
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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reopen: https://code.djangoproject.com/ticket/30203
Simplified for example:
have simple query
{{{
qs1: QuerySet = User.objects.filter(id__gt=10)
qs1 = qs1.values('is_active').annotate(id=Count('pk'))
}}}
generate:
{{{
SELECT "suser_customuser"."is_active",
COUNT("suser_customuser"."id") AS "id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" > 10
GROUP BY "suser_customuser"."is_active"
}}}
all correct, now i wont use union
{{{
qs1: QuerySet = User.objects.filter(id__gt=10)
qs2: QuerySet = User.objects.filter(id__lt=10)
qs1 = qs1.values('is_active').annotate(id=Count('pk'))
}}}
now get not correct SQL:
{{{
(SELECT "suser_customuser"."is_active",
"suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" > 10)
UNION
(SELECT "suser_customuser"."is_active",
"suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" < 10)
}}}
expected:
{{{
select *
from
((SELECT "suser_customuser"."is_active",
"suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" > 10)
UNION
(SELECT "suser_customuser"."is_active",
"suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" < 10)) U0
group by is_active, id
}}}
i think this is bug, if not why not show any warning or exception?
or just say how rewrite query for correct use Subquery
screenshot:
http://dl4.joxi.net/drive/2019/02/24/0002/0003/143363/63/2eab4a5318.jpg
--
Ticket URL: <https://code.djangoproject.com/ticket/30209>
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