Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20503
`unicode(fields).encode("utf8")`: in this case, we will try to decode it by
system default encoding first and then encode it by udf-8 if the input is `str`
(bytes). So, for example, I think `unicode("ì")` case won't work.
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