#31150: SELECT DISTINCT is not not so distict
-------------------------------------+-------------------------------------
Reporter: Johannes Hoppe | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 3.0
(models, ORM) |
Severity: Release blocker | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Johannes Hoppe):
* status: closed => new
* resolution: needsinfo =>
Comment:
@felixxm, it seems that `Subquery` annotation are omitted from the
grouping section in 3.0. I will try to create a test case today.
If you add the following test to 2.2.* anywhere in `tests.aggregation` it
will pass, in 3.0 it will fail, because the subquery is missing from the
grouping bit:
{{{
def test_filtered_aggregate_ref_subquery_annotation_e_31150(self):
aggs = Author.objects.annotate(
earliest_book_year=Subquery(
Book.objects.filter(
contact__pk=OuterRef('pk'),
).order_by('pubdate').values('pubdate__year')[:1]
),
).annotate(max_id=Max('id'))
print(aggs.query)
self.assertIn(str(aggs.query), """
SELECT "aggregation_author"."id", "aggregation_author"."name",
"aggregation_author"."age", (SELECT django_date_extract('year',
U0."pubdate") FROM "aggregation_book" U0 WHERE U0."contact_id" =
("aggregation_author"."id") ORDER BY U0."pubdate" ASC LIMIT 1) AS
"earliest_book_year", MAX("aggregation_author"."id") AS "max_id" FROM
"aggregation_author" GROUP BY "aggregation_author"."id",
"aggregation_author"."name", "aggregation_author"."age", (SELECT
django_date_extract('year', U0."pubdate") FROM "aggregation_book" U0 WHERE
U0."contact_id" = ("aggregation_author"."id") ORDER BY U0."pubdate" ASC
LIMIT 1)
""")
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/31150#comment:4>
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