Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4176#issuecomment-71170456
The argument I can see against it is simply that you want to fail fast on
bad input, not sort of continue. If all of the file is like this you'll just
log a zillion warnings instead of just stopping. How about changing the warning
to throw a standard exception like `IllegalArgumentException` using `require`?
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