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https://issues.apache.org/jira/browse/SPARK-20909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027694#comment-16027694
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Yuming Wang commented on SPARK-20909:
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I'm work on this.
> Build-in SQL Function Support - DAYOFWEEK
> -----------------------------------------
>
> Key: SPARK-20909
> URL: https://issues.apache.org/jira/browse/SPARK-20909
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Yuming Wang
> Labels: starter
>
> {noformat}
> DAYOFWEEK(date)
> {noformat}
> Return the weekday index of the argument.
> Ref:
> https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_dayofweek
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