Dmitry Sysolyatin created SPARK-36561:
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             Summary: Remove `ColumnVector.numNulls`
                 Key: SPARK-36561
                 URL: https://issues.apache.org/jira/browse/SPARK-36561
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.2.0
            Reporter: Dmitry Sysolyatin


Hi!
When I was implementing ColumnVector abstract class I started to check where 
`numNulls` is used in spark source code. I didn't find any places where it is 
used except tests

Is there any plans to use it in the future. If no then I suppose to remove 
`numNulls` method.



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