Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5432#issuecomment-91079896
This PR is an updated version of #4845. I rebased the code on top of
current master, added the suggestions I made on the original PR, fixed a bunch
of style nits and other issues, and added a couple of tests. Here's a
screenshot:
<img src="http://i.imgur.com/EUGSRKQ.png";>
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