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https://issues.apache.org/jira/browse/SPARK-25469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622842#comment-16622842
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Apache Spark commented on SPARK-25469:
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User 'mn-mikke' has created a pull request for this issue:
https://github.com/apache/spark/pull/22471
> Eval methods of Concat, Reverse and ElementAt should use pattern matching
> only once
> -----------------------------------------------------------------------------------
>
> Key: SPARK-25469
> URL: https://issues.apache.org/jira/browse/SPARK-25469
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0, 3.0.0
> Reporter: Marek Novotny
> Priority: Major
>
> Pattern matching is utilized for each call of {{Concat.eval}},
> {{Reverse.nullSafeEval}} and {{ElementAt.nullSafeEval}} and thus for each
> record of a dataset. This could lead to a performance penalty when expression
> are executed in the interpreted mode. The goal of this ticket is to reduce
> usage of pattern matching within the mentioned "eval" methods.
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