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https://issues.apache.org/jira/browse/SPARK-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-2991.
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Resolution: Won't Fix
> RDD transforms for scan and scanLeft
> -------------------------------------
>
> Key: SPARK-2991
> URL: https://issues.apache.org/jira/browse/SPARK-2991
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Reporter: Erik Erlandson
> Assignee: Erik Erlandson
> Priority: Minor
> Labels: features
>
> Provide RDD transforms analogous to Scala scan(z)(f) (parallel prefix scan)
> and scanLeft(z)(f) (sequential prefix scan)
> Discussion of a scanLeft implementation:
> http://erikerlandson.github.io/blog/2014/08/09/implementing-an-rdd-scanleft-transform-with-cascade-rdds/
> Discussion of scan:
> http://erikerlandson.github.io/blog/2014/08/12/implementing-parallel-prefix-scan-as-a-spark-rdd-transform/
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