otterc commented on PR #40393:
URL: https://github.com/apache/spark/pull/40393#issuecomment-1474749275

   @Stove-hust The main change in `DAGScheduler` looks good to me. Basically, 
[here](https://github.com/apache/spark/blob/11c9838283e98d5ebe6ce13b85e26217494feef2/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L762)
 we also check whether the parent stage is finalized and if it is not we submit 
that. The reason the parent stage is not getting finalized here is because it 
has no tasks. 
   Will review the UT and take another look at the code next week. Thanks for 
addressing this.


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