Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/22234
> cc @MaxGekk for a followup
@HyukjinKwon Do you mean to update migration guide in master and probably
in Spark 2.4? I don't think this should be considered as a bug because current
version and previous versions of Spark can read saved CSV files correctly. Yes,
for now empty strings are saved as `""` and `null`s as nothing but this is
supposed to be to distinguish empty string and null in read. And produced CSV
files are valid, and they can be read by any mature CSV libs.
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