Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/13041#issuecomment-218602160
@andrewor14 they are related because the first row is already parsed by
Univocity parser in which `nullValue` is set,
[here](https://github.com/apache/spark/blob/ac12b35d31ef1d1663511bf6ae826a9cc0278f20/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVParser.scala#L48).
Both PRs are handling `nullValue` to treat `""` and empty string and it seems
currently `nullValue` with Univocity parser is working differently with what
Spark expected in CSV datasource library. This is what I meant confusing.
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