Github user rxin commented on the pull request: https://github.com/apache/spark/pull/4067#issuecomment-70215975 Hey @ksakellis - Thanks for working on this. I took a very quick look at the patch. Overall I feel the patch should be fairly straightforward, but the specific implementations might've gone a bit over board with Scala language features (a lot of Options, orElse, closures, etc) and design (too many new classes introduced). If we can reduce those, the pr would be a lot easier to understand.
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