wangyum commented on PR #41545:
URL: https://github.com/apache/spark/pull/41545#issuecomment-1588575612

   Yes. This PR aiming to selectively tune a large RDD only while keeping the 
existing behavior in the same ways in small RDDs.
   
   Increase `spark.sql.files.maxPartitionBytes` directly has these issues:
   1. There are multiple data sources in one SQL, setting 
`spark.sql.files.maxPartitionBytes` will affect all data sources.
   2.  We don't know how much `spark.sql.files.maxPartitionBytes` should be set 
to, sometimes it may be very large(May be more than 20GiB).
   
   


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