Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20217
Another way is to change the default value of `returnType` of
`registerFunction` to None. To avoid the behavior change, we can set
`returnType` for Python functions to `StringType` internally. For UDFs, we can
issue an error when the input returnType and UDF's returnType do not match, if
the input `returnType` is not `None`.
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