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https://issues.apache.org/jira/browse/SPARK-8301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14583760#comment-14583760
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Reynold Xin commented on SPARK-8301:
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I think we can take whatever the JVM source code does, or write a version using
Unsafe.
> Improve UTF8String substring/startsWith/endsWith/contains performance
> ---------------------------------------------------------------------
>
> Key: SPARK-8301
> URL: https://issues.apache.org/jira/browse/SPARK-8301
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Reynold Xin
> Priority: Critical
>
> Many functions in UTF8String are unnecessarily expensive.
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