Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/21631
> But first we should be sure if it's a bug or not for this anyway.
I will try to reproduce it on small example without Spark. I am not sure
what the expected behavior should be if set of selected columns is empty.
Should the `parseLine` return `null`, empty `array` of `String`s or something
else. Will see...
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