planga82 commented on pull request #28896:
URL: https://github.com/apache/spark/pull/28896#issuecomment-648255662


   @HyukjinKwon It's exactly what you say, it only happens when the 
incompatibility is inside one partition. I will change the PR to use 
compatibleType, and I will make some performance test. Thanks for your help!
   
   @cloud-fan I tested the same situation with json and it works fine, we don't 
have problems there


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