Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20648
> allows the length of tokens are shorter than its schema, putting nulls
(or NA) into missing fields
Actually I also recalled this is a valid case for csv, and I remember that
we did this intentionally. How much can we clean up if we want to keep this
behavior in csv? If it's not a lot, maybe we don't need to bother to do
refactoring.
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