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https://issues.apache.org/jira/browse/SPARK-6638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389804#comment-14389804
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Apache Spark commented on SPARK-6638:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/5303
> optimize StringType in SQL
> --------------------------
>
> Key: SPARK-6638
> URL: https://issues.apache.org/jira/browse/SPARK-6638
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> java.lang.String is encoded in UTF-16, it's not efficient for IO. We could
> change to use Array[Byte] of UTF-8 internally for better performance.
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