Github user keypointt commented on the issue:
https://github.com/apache/spark/pull/17451
thanks Nick, I also referenced to Py4J docs
https://www.py4j.org/advanced_topics.html , and scala `tuple` seems not
supported:
`Py4J allows elements to be modified (like a real Java array), which is not
the case of true immutable sequences like tuples.`
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