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https://issues.apache.org/jira/browse/SPARK-20770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-20770.
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Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 18002
[https://github.com/apache/spark/pull/18002]
> Improve ColumnStats
> -------------------
>
> Key: SPARK-20770
> URL: https://issues.apache.org/jira/browse/SPARK-20770
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Kazuaki Ishizaki
> Fix For: 2.3.0
>
>
> We improve the implementation of {{ColumnStats}} by using the following
> approaches.
> 1. Declare subclasses of {{ColumnStats}} as {{final}}
> 2. Remove unnecessary call of {{row.isNullAt(ordinal)}}
> 3. Remove the dependency on {{GenericInternalRow}}
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