Github user antoniobarbuzzi commented on the issue:
https://github.com/apache/spark/pull/12904
I agree with @HyukjinKwon and comment
https://github.com/apache/spark/pull/12904#issuecomment-217605160, except for
third use case, i.e. I'd rather do this:
With the option, nullValue set to `""`
`"","a",` should be converted to `Row("", "a", null)`
In fact, just like the univocity parser does
[here](https://github.com/uniVocity/univocity-parsers/blob/master/src/main/java/com/univocity/parsers/csv/CsvParserSettings.java#L63-L72):
> if the parser does not read any character from the input, and the input
is within quotes , the empty is used instead of an empty string
Regarding the PR, I'd deletegate the handling of this to the univocity
parser, setting the `settings.setEmptyValue(params.emptyValue)` in the
univocity's CSVSettings
[here](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVParser.scala#L34)
and
[here](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVParser.scala#L77)
too.
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