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https://issues.apache.org/jira/browse/SPARK-8263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14579936#comment-14579936
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Cheng Hao commented on SPARK-8263:
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I'll take this one.
> string function: substr/substring should also support binary type
> -----------------------------------------------------------------
>
> Key: SPARK-8263
> URL: https://issues.apache.org/jira/browse/SPARK-8263
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Priority: Minor
>
> See Hive's:
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
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