Jackie-Jiang commented on issue #7835:
URL: https://github.com/apache/pinot/issues/7835#issuecomment-982220389


   Understood. In order to solve `IS NULL` and `IS NOT NULL`, we need to access 
the `NullValueVector` index. Currently case transform function does not support 
accessing index, so I'm suggesting adding general index access support to case 
transform function when we try to resolve this issue instead of specialize the 
null index.


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