Github user hhbyyh commented on the issue:

    https://github.com/apache/spark/pull/18902
  
    Hi @zhengruifeng Thanks for the idea and implementation. Definitely 
something worth exploring.
     
    As I understand, the new implementation improves the locality yet it 
leverages RDD API instead of Dataset API. Since overall this targets a 
performance improvement, I'd be interested to see the performance comparison. 


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