Github user lw-lin commented on the issue:
https://github.com/apache/spark/pull/14118
> What if I am writing explicitly an empty string out? Does it become just
1,,2?
Yes. It becomes `1,,2` in 2.0, and the same `1,,2` with this patch -- no
behavior changes.
> Can you also clarify whether this is behavior changing, or something else?
This patch behaves differently from 2.0 when reading `1,,2` back: (given
`nullValue` the default value: empty string ""), `1,,2` would be read back as
`1,,2` in 2.0, but would be read back as `1,[null],[null],2` with this patch.
@rxin ~
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