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https://issues.apache.org/jira/browse/SPARK-10496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249560#comment-15249560
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zhengruifeng commented on SPARK-10496:
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I can have a try. Add this new API in DataFrameStatFunctions.
> Efficient DataFrame cumulative sum
> ----------------------------------
>
> Key: SPARK-10496
> URL: https://issues.apache.org/jira/browse/SPARK-10496
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> Goal: Given a DataFrame with a numeric column X, create a new column Y which
> is the cumulative sum of X.
> This can be done with window functions, but it is not efficient for a large
> number of rows. It could be done more efficiently using a prefix sum/scan.
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