uranusjr commented on PR #27491:
URL: https://github.com/apache/airflow/pull/27491#issuecomment-1305409323

   Alright, everything should work now. Again, the first two commits are not 
relevant, only the latter two. The logic change is mostly
   
   1. Move things from MappedOperator to AbstractOperator.
   2. Remove some checks so task expansion works not only for MappedOperator, 
but also BaseOperator in a MappedTaskGroup.
   3. Add logic so MappedArgument (stand-in reference passed from 
MappedTaskGroup to BaseOperator in it) can register task dependencies like 
XComArg.
   
   Some minor refactoring is involved as well. Since most of the logic is 
exactly the same as MappedOperator, I only added one test to ensure the same 
code paths are visited for MappedTaskGroup child operators.


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