#36453: 5.2.3 introduces a regression when using `Value(None,
output_field=JSONField()` in a `When` clause.
-------------------------------------+-------------------------------------
Reporter: Thomas | Type: Bug
Status: new | Component: Database
| layer (models, ORM)
Version: 5.2 | 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
-------------------------------------+-------------------------------------
We've tried to upgrade to 5.2.3 and several of our tests started failing.
We've pinpointed the problem to one query which uses `Value(None,
output_field=JSONField()` in a `When` clause. Here's a minimal
reproducible example (with a `WHERE` clause too, to highlight the
difference in behavior):
{{{
from django.db import connection
from django.db.models import (
BigIntegerField,
Case,
F,
JSONField,
Model,
Value,
When,
)
from django.db.models.functions import Cast
class Foo(Model):
bar = BigIntegerField(blank=True, null=True)
json_field = JSONField(blank=True, null=True)
if __name__ == '__main__':
Foo.objects.filter(
json_field__key_1=Value(None, output_field=JSONField())
).update(
bar=Case(
When(
json_field__key_2=Value(None, output_field=JSONField()),
then=None
),
default=Cast(F('json_field__key_2'), BigIntegerField()),
output_field=BigIntegerField(),
),
)
print(connection.queries[-1]['sql'])
}}}
We ran this code with 5.2.2 (with this version our test suite passes) and
5.2.3 (with this version our test suite fails) and got this:
{{{
-- Generated with Django 5.2.2
UPDATE "polls_foo"
SET "bar" = CASE WHEN (
("polls_foo"."json_field" -> 'key_2') = 'null'::jsonb -- JSON
"null"
)
THEN NULL
ELSE (("polls_foo"."json_field" -> 'key_2'))::bigint
END
WHERE ("polls_foo"."json_field" -> 'key_1') = 'null'::jsonb;
-- Generated with Django 5.2.3
UPDATE "polls_foo"
SET "bar" = CASE WHEN (
("polls_foo"."json_field" -> 'key_2') = NULL -- SQL NULL
)
THEN NULL
ELSE (("polls_foo"."json_field" -> 'key_2'))::bigint
END
WHERE ("polls_foo"."json_field" -> 'key_1') = 'null'::jsonb;
}}}
Notice how the `WHEN` clause differs, but the `WHERE` clause stays the
same, despite both using the same `Value(None, output_field=JSONField())`
syntax.
--
Ticket URL: <https://code.djangoproject.com/ticket/36453>
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