[GitHub] [airflow] uranusjr commented on issue #28535: Dynamic Task Mapping: No tasks are mapped, although the list to be mapped is not empty

[GitBox <gi...@apache.org>]

uranusjr commented on issue #28535:
URL: https://github.com/apache/airflow/issues/28535#issuecomment-1369456393

   I simplified the DAG to this bare minimum and it ran fine for me:
   
   ```python
   from datetime import datetime
   from airflow.decorators import task
   from airflow.models import DAG, BaseOperator
   
   class CustomOperator(BaseOperator):
       def __init__(self, task_id, app_task_id, **kwargs):
           super(CustomOperator, self).__init__(task_id=task_id, **kwargs)
           self._app_task_id = app_task_id
   
       def execute(self, context):
           pass
   
   @task
   def get_tasks_by_tag():
       return [f"task_{i}" for i in range(3)]
   
   with DAG(dag_id="custom_expand", schedule=None, start_date=datetime(2023, 1, 1)) as dag:
       CustomOperator.partial(task_id='start_task').expand(app_task_id=get_tasks_by_tag())
   ```
   
   It would be awesome if you could simplify the code a bit to help identify what part exactly is causing your DAG to malfunction. As far as I can tell, the expansion logic does not seem to be the issue. 


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