Github user viirya commented on the issue:
https://github.com/apache/spark/pull/22610
@HyukjinKwon Thanks!
I agree that having document of this is definitely useful. I will try to
add it and let's see if it is ok for you. I think it is good to mention that
users are responsible for ensuring return type of Pandas UDF matches defined
return type. The mapping is good reference to show in the document too.
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