Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/6434#issuecomment-106059408
I agree that it's not good practice to throw `Exception`, or
`RuntimeException`, as these are generic base classes. `sys.error` just causes
a `RuntimeException` though. I think that's not a real improvement and is less
clear, and `sys.error` isn't used in the rest of the code as a rule anyway.
Instead these should be more meaningful exception types.
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