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https://issues.apache.org/jira/browse/SPARK-24871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-24871.
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Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 21824
[https://github.com/apache/spark/pull/21824]
> Refactor Concat and MapConcat to avoid creating concatenator object for each
> row.
> ---------------------------------------------------------------------------------
>
> Key: SPARK-24871
> URL: https://issues.apache.org/jira/browse/SPARK-24871
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Takuya Ueshin
> Assignee: Takuya Ueshin
> Priority: Major
> Fix For: 2.4.0
>
>
> Refactor {{Concat}} and {{MapConcat}} to:
> - avoid creating concatenator object for each row.
> - make {{Concat}} handle {{containsNull}} properly.
> - make {{Concat}} shortcut if {{null}} child is found.
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