[jira] [Resolved] (SPARK-20770) Improve ColumnStats

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-20770.
---------------------------------
       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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