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https://issues.apache.org/jira/browse/SPARK-16041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15337552#comment-15337552
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Apache Spark commented on SPARK-16041:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/13756
> Disallow Duplicate Columns in `partitionBy`, `blockBy` and `sortBy` in
> DataFrameWriter
> --------------------------------------------------------------------------------------
>
> Key: SPARK-16041
> URL: https://issues.apache.org/jira/browse/SPARK-16041
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
>
> Duplicate columns are not allowed in `partitionBy`, `blockBy`, `sortBy` in
> DataFrameWriter. The duplicate columns could cause unpredictable results. For
> example, the resolution failure.
> We should detect the duplicates and issue exceptions with appropriate
> messages.
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