Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20567
The root cause is Arrow conversion in Python side interprets binaries as
`str`, and I here avoided this by checking if the type is what we supported or
not.
This is the most trivial fix. I made a fix safe and small as possible as I
can here. I can fix the error message only but the size of change and diff is
virtually the same -
https://github.com/apache/spark/pull/20567#issuecomment-365064243.
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