GitHub user erikerlandson opened a pull request:
https://github.com/apache/spark/pull/1909
[SPARK-2991] Implement RDD lazy transforms for scanLeft and scan
Discussion of implementations:
http://erikerlandson.github.io/blog/2014/08/09/implementing-an-rdd-scanleft-transform-with-cascade-rdds/
http://erikerlandson.github.io/blog/2014/08/12/implementing-parallel-prefix-scan-as-a-spark-rdd-transform/
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/erikerlandson/spark spark-2991-pr
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1909.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1909
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commit 4555c5b080bc4adeb198c57aeca6e86ca862f545
Author: Erik Erlandson <[email protected]>
Date: 2014-08-02T01:43:28Z
[SPARK-2991] Implement RDD lazy transforms for scanLeft and scan
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