Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21192
It's stuck. I kept pinging and gave up.
> Do users need to understand the array option string format and parse it
themselves?
Yea, I think this is the reason why it's stuck. I believe there's no easier
other option. It's at least not a custom format but a standard JSON.
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