Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/15587
@rxin How about this way: modify the parameter as
`Option[PartitionerCoalescer with Serializable]`, so that if user forget to
mark the implementation class as serializable, compiling time will print the
error rather than the runtime throw some unreadable exceptions... what do you
think about it ?
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