syhstanley opened a new pull request, #64320:
URL: https://github.com/apache/airflow/pull/64320
closes: #63927
The `GET /api/v2/dags/{dag_id}/tasks` endpoint raises a `TypeError` when
sorting tasks by attributes that contain `None` values (e.g. `start_date`
on unscheduled DAGs), because Python cannot compare `None` with other types.
**Changes:**
- Add a null-safe `sort_key` function inside `get_tasks` that uses tuple
comparison to place `None` values last on ascending sort and first on
descending sort, matching default PostgreSQL `NULLS LAST` / `NULLS FIRST`
behaviour.
- Add a `test_mixed_start_date_dag` test DAG with mixed `None` and non-`None`
`start_date` values.
- Add test cases for:
- Ascending/descending sort with all-`None` values
- Ascending/descending sort with mixed `None`/non-`None` values (verifies
actual ordering)
- Ascending/descending sort by `task_id`
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