Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/10640#issuecomment-170364496
It's not an issue in other languages since the other APIs don't take a
function in `sortByKey`. I'm actually not sure why it exists here. The example
isn't bogus right, just redundant? reversing the sign of the keys would
definitely change the order right? or are you saying the method doesn't work?
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