#32126: Empty Case() annotation crashes when used with GROUP BY
-------------------------------------+-------------------------------------
Reporter: Hannes | Owner: Hannes Ljungberg
Ljungberg |
Type: Bug | Status: assigned
Component: Database | Version: 3.1
layer (models, ORM) |
Severity: Normal | Keywords:
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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Annotating a queryset with a `Case` without any cases will generate an
invalid query when used with a `GROUP BY`.
Example:
{{{
qs = (
CaseTestModel.objects.values('string')
.annotate(test=Case(output_field=IntegerField()),
integer_sum=Sum('integer'))
.order_by('string')
)
}}}
Executing this queryset generates the following SQL:
{{{
SELECT "expressions_case_casetestmodel"."string", NULL AS "test",
SUM("expressions_case_casetestmodel"."integer") AS "integer_sum" FROM
"expressions_case_casetestmodel" GROUP BY
"expressions_case_casetestmodel"."string", NULL ORDER BY
"expressions_case_casetestmodel"."string" ASC
}}}
Causing the following error:
{{{
django.db.utils.ProgrammingError: non-integer constant in GROUP BY
LINE 1: ...OUP BY "expressions_case_casetestmodel"."string", NULL ORDER...
}}}
The `Case` annotation should be excluded from the `GROUP BY` if it
contains no cases.
--
Ticket URL: <https://code.djangoproject.com/ticket/32126>
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