Github user viirya commented on the issue:
https://github.com/apache/spark/pull/22610
Thanks @BryanCutler! Yes, this should not be a bug but is used as a warning
to users that there might be some type conversion they are not noticed at first
glance on the Pandas UDFs. For now the conversion is silently done behind the
scene and as the case in the JIRA shows it might not be easily noticed that
Pandas.Series from UDFs isn't matched with defined UDFs' return types.
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