dabla commented on PR #48868:
URL: https://github.com/apache/airflow/pull/48868#issuecomment-2808929718

   Maybe do something like:
   
   @get_task_map_length.register
   def _(xcom_arg: FilterXComArg, resolved_val: Sized, upstream_map_indexes: 
dict[str, int]):
       raise NotImplementedError(
           "Cannot determine map length for FilterXComArg until filtered values 
are fully evaluated"
       )


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