leanken commented on pull request #29547:
URL: https://github.com/apache/spark/pull/29547#issuecomment-681291235


   > Thanks @leanken for the fix. Just wondering is it possible to add a unit 
test for the issue?
   
   I considered adding a UT for this issue, too. But it's wrong usage about 
using scala object with Externalizable interface, since it is removed, I think 
scala case object itself can guarantee the serialization; besides, I've run the 
entire TPCDS just to make sure the E2E coverage, I think it should be enough, 
^_^


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