yaooqinn commented on PR #50576:
URL: https://github.com/apache/spark/pull/50576#issuecomment-2800397089

   > Why are we doing this ?
   
   This is bugfix that fails cache queries with string cols using 
spark.kryo.registrationRequired=true & 
spark.serializer=org.apache.spark.serializer.KryoSerializer
   
   
   > Given UTF8String gets used by a lot of external libraries, dropping 
KryoSerializable from its interfaces can be breaking for users.
   
   I was thinking that unsafe is spark private, I revert the changes in 
UTF8String


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