zabetak commented on PR #6418:
URL: https://github.com/apache/hive/pull/6418#issuecomment-4371980332

   @konstantinb Thanks for the detailed answer.
   
   NULL is not an actual value so not sure if it should be reflected in the 
NDV. In other words, maybe we should not adjust NDV at all independent if it is 
constant or not. I think we have discussed this at some point but don't 
remember if we concluded somewhere. Have you explored this alternative?


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