AngersZhuuuu opened a new pull request #24124: mapPartition to replace map to 
speedUp Dataset's toLocalIterator process
URL: https://github.com/apache/spark/pull/24124
 
 
   ## What changes were proposed in this pull request?
   
   For this change, it use mapPartitionsInternal method replace map method to 
speed up decode process to parallel execution
   https://issues.apache.org/jira/browse/SPARK-27185
   ## How was this patch tested?
   
   Build project and run in our enviroment
   
   Please review http://spark.apache.org/contributing.html before opening a 
pull request.
   

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