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https://issues.apache.org/jira/browse/SPARK-27839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-27839.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 24707
[https://github.com/apache/spark/pull/24707]
> Improve UTF8String.replace() / StringReplace performance
> --------------------------------------------------------
>
> Key: SPARK-27839
> URL: https://issues.apache.org/jira/browse/SPARK-27839
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Major
> Fix For: 3.0.0
>
>
> The UTF8String.replace() function and StringReplace expression are missing a
> few common-case optimizations, such as avoiding copies when the replacement
> does not change the string and avoiding redundant copying / decoding of the
> search and replacement strings in case they are constants.
> I think there's room to significantly improve performance here, especially
> for single-character replacements.
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