#32200: Aggregating when grouping on an ExpressionWrapper omits the expression
from
the group by
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Reporter: Gordon Wrigley | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 3.1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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I ran into this with Postgres on Django 3.1.3, I'm not sure what other
versions it exists on.
{{{
#!python
print(
Fred.objects.annotate(
bob_id__is_null=ExpressionWrapper(
Q(bob_id=None),
output_field=BooleanField()
)
).values(
"bob_id__is_null"
).annotate(
id__count=Count("id", distinct=True)
).values(
"bob_id__is_null",
"id__count"
).query
)
}}}
{{{
#!sql
SELECT
"main_fred"."bob_id" IS NULL AS "bob_id__is_null",
COUNT(DISTINCT "main_fred"."id") AS "id__count"
FROM "main_fred"
GROUP BY "main_fred"."bob_id"
}}}
On the last line there the group by has dropped the "IS NULL"
--
Ticket URL: <https://code.djangoproject.com/ticket/32200>
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