#30771: Filtering on query result overrides GROUP BY of internal query
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Reporter: Aur Saraf | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 2.2
layer (models, ORM) | Keywords: annotate,
Severity: Normal | annotation, filter, groupby,
Triage Stage: | aggregate, aggregation
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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{{{#!python
from django.contrib.auth import models
a =
models.User.objects.filter(email__isnull=True).values('email').annotate(m=Max('id')).values('m')
print(a.query) # good
# SELECT MAX("auth_user"."id") AS "m" FROM "auth_user" WHERE
"auth_user"."email" IS NULL GROUP BY "auth_user"."email"
print(a[:1].query) # good
# SELECT MAX("auth_user"."id") AS "m" FROM "auth_user" WHERE
"auth_user"."email" IS NULL GROUP BY "auth_user"."email" LIMIT 1
b = models.User.objects.filter(id=a[:1])
print(b.query) # GROUP BY U0."id" should be GROUP BY U0."email"
# SELECT ... FROM "auth_user" WHERE "auth_user"."id" = (SELECT U0."id"
FROM "auth_user" U0 WHERE U0."email" IS NULL GROUP BY U0."id" LIMIT 1)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/30771>
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