Github user dongjoon-hyun commented on the issue:

    https://github.com/apache/spark/pull/22179
  
    I pinged the first one, SPARK-20389, to find any chance to test on the 
original cluster. Although it's too old issue, but there is no harm for us to 
ping once more.
    
    For the third one, SPARK-25176, the reporter provided the sample code. 
Although the code is open for us, but it's not Apache license. We can make our 
own test case for type-inheritance.
    > You can find a simple test to reproduce the issue [4].
    - [4] https://github.com/mpryahin/kryo-parametrized-type-inheritance
      - 
https://github.com/mpryahin/kryo-parametrized-type-inheritance/blob/master/src/main/java/io/cleverdata/dmpkit/BaseType.java


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