[GitHub] [airflow] hussein-awala commented on issue #31677: Task ser/des not working for multiple return values

["hussein-awala (via GitHub)" <gi...@apache.org>]

hussein-awala commented on issue #31677:
URL: https://github.com/apache/airflow/issues/31677#issuecomment-1573490372

   This is not a bug. It is not possible to unpack an Xcom in parsing time because it does not exist at that moment. Xcom is created at runtime after the first task is executed:
   ```python
   from datetime import datetime
   
   from airflow.decorators import dag, task
   
   @dag(schedule=None, start_date=datetime(2023, 1, 1), catchup=False)
   def testdag():
   
       @task()
       def test():
           return 'x', 'y'
   
       @task()
       def process_x(values):
           x = values[0]
           print(x)
   
       @task()
       def process_y(values):
           y = values[1]
           print(y)
   
       returned_values = test()
       process_x(returned_values)
       process_y(returned_values)
   
   testdag()
   ```


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