django__django-13757
Based on my knowledge of Django's codebase and the issue description, I can provide the patch. The issue is in Django's django/db/models/fields/json.py file where the KeyTransformIsNull lookup doesn't properly exclude JSON null values on…
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Content
Based on my knowledge of Django's codebase and the issue description, I can provide the patch. The issue is in Django's `django/db/models/fields/json.py` file where the `KeyTransformIsNull` lookup doesn't properly exclude JSON null values on SQLite and Oracle when using `__isnull=True`.
The problem is that on SQLite and Oracle, when checking `isnull=True`, the current implementation just checks if the JSON path extraction returns NULL (using `IS NULL`), but this doesn't distinguish between:
1. The key doesn't exist (should match)
2. The key exists with JSON `null` value (should NOT match)
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