Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21631
@MaxGekk yea, I noticed that behaviour. Probably, in case we set an empty
array in `CommonSettings.selectIndexes`, it seems `UnivocityParser` returns
null for valid input? I'm not sure setting an empty array there is valid.
Anyway, to fix this bug, I think we don't need to check values record-by-record
because `reuiqredSchema` is empty as @HyukjinKwon said.
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