Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7841#issuecomment-150713518
I like your 2nd interface more (group by and then pivot), since it is
easier to get that working for both Java and Scala. We can implement a simpler
interface for Python/R that's closer to existing frameworks.
How hard would it be to not require the values?
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