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https://issues.apache.org/jira/browse/SPARK-7135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14943151#comment-14943151
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Martin Senne commented on SPARK-7135:
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@[~rxin]: Please see my description in SPARK-10868 .
> Expression for monotonically increasing IDs
> -------------------------------------------
>
> Key: SPARK-7135
> URL: https://issues.apache.org/jira/browse/SPARK-7135
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Labels: dataframe
> Fix For: 1.4.0
>
>
> Seems like a common use case that users might want a unique ID for each row.
> It is more expensive to have consecutive IDs, since that'd require two pass
> over the data. However, many use cases can be satisfied by just having unique
> ids.
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