Github user icexelloss commented on the issue:
https://github.com/apache/spark/pull/20163
I think Scalar and Group map UDF expect pandas Series of datetime64[ns]
(native pandas timestamp type) instead of a pandas Series of datetime.date and
datetime.datetime object. I don't think it's necessary to have pandas UDF to
work with a pandas Series of datetime.date or datetime.datetime object, as the
standard type of timestamp is datetime64[ns] in pandas.
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