clintropolis opened a new pull request #9112: null handling for doubles sketch 
and array of doubles sketch aggs
URL: https://github.com/apache/druid/pull/9112
 
 
   ### Description
   
   Similar to #9073 and #9075, this PR modifies doubles sketch and array of 
doubles sketch aggregators to ignore null valued rows when SQL compatible null 
handling mode is enabled.
   
   Note that it is still possible to treat `null` valued rows as `0` in SQL 
compatible null handling mode _if desired by the user_, through using virtual 
columns with `nvl`, as illustrated in one of the added tests.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added unit tests or modified existing tests to cover new code paths.
   

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