jihoonson opened a new pull request #12268:
URL: https://github.com/apache/druid/pull/12268


   ### Description
   
   A follow-up of https://github.com/apache/druid/pull/12250 to add integration 
tests for querying null-only columns using SQL.
   
   <hr>
   
   ##### Key changed/added classes in this PR
    * `ITNilColumnTest`
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added integration tests.
   


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