Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18581
I guess we need few more tests about CSV and changes. Let me leave this out
in the documentation here for now.
Few more test cases should be about writing out with a custom line separator
```
["a\n\na", "\nb"]
```
and reading in value without quotes with a custom line separator
```
a\n\na,\nb
```
which currently do not work with the current state. We need
`setNormalizedNewline` in this case but it looks this is limited to single
character for now.
I can make a follow-up later if we are all fine with leaving this
documentation out.
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