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https://issues.apache.org/jira/browse/SPARK-58799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Serge Rielau resolved SPARK-58799.
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Resolution: Done
> R1: transforming string expressions return STRING
> -------------------------------------------------
>
> Key: SPARK-58799
> URL: https://issues.apache.org/jira/browse/SPARK-58799
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 5.0.0
> Reporter: Serge Rielau
> Priority: Major
>
> upper/substr/concat/||/... return plain STRING. Example:
> 'he'::CHAR(4)||'llo'::CHAR(3) => 'he llo' typed STRING.
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