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https://issues.apache.org/jira/browse/SPARK-53552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-53552:
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Assignee: Wan Kun
> Optimize substr SQL function
> -----------------------------
>
> Key: SPARK-53552
> URL: https://issues.apache.org/jira/browse/SPARK-53552
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Wan Kun
> Assignee: Wan Kun
> Priority: Minor
> Labels: pull-request-available
>
> In substringSQL() functions, if pos > 0 then we don't need to calculate
> numChars().
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