Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14118
IMHO, handling `StringType` at least lets users handling `null`s in
roundtrip in writing and reading. CSV writes `null` according to `nullValue`
[here](https://github.com/apache/spark/blob/38cf8f2a50068f80350740ac28e31c8accd20634/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVParser.scala#L78)
but this can't read them back if it does not handle `StringType`.
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