cloud-fan commented on pull request #29152:
URL: https://github.com/apache/spark/pull/29152#issuecomment-663342893


   > It seems df.createTempView is a use case of NullType with in-memory.
   
   That's a good point. Then I think we should support NullType in permanent 
views as well. @ulysses-you can you open a PR to do it? 


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