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https://issues.apache.org/jira/browse/SPARK-23905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430128#comment-16430128
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yucai commented on SPARK-23905:
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I can work on this.
> Add UDF weekday
> ---------------
>
> Key: SPARK-23905
> URL: https://issues.apache.org/jira/browse/SPARK-23905
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Priority: Major
>
> Returns the weekday index for _{{date}}_ ({{0}} = Monday, {{1}} = Tuesday, …
> {{6}} = Sunday). This is different from dayofweek, in which, the index is
> based on (1 = Sunday, 2 = Monday, ..., 7 = Saturday)
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