Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/19738
I saw some cases for ML input using unicode chars, but that was it. I
think for the purposes here, it is maybe not necessary. I manually verified
that without converting unicode Pandas column names the test fails, and so that
might be good enough. What do you think @HyukjinKwon ?
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