Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/10441#issuecomment-166756541
Note that my exception changes were actually motivated by a case where this
error-handling logic swallowed other internal exceptions and only printed "1"
as output. The problem is that the `try-catch` blocks here are capable of
intercepting exceptions which occur as a result of internal programming errors
/ violated assumptions, not just bad user input.
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