gortiz commented on issue #16821:
URL: https://github.com/apache/pinot/issues/16821#issuecomment-3293706217

   This change was added in https://github.com/apache/pinot/pull/16658. The PR 
explains the issue, but the TL;DR: is it was a bug fix when, like in they query 
you include here, only basic null handling is used. When that happens, IS NULL 
cannot be removed because our null implementation is not actually compatible 
with SQL semantics.
   
   If null handling is enabled, the plan should be what you expect


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