Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20217
Deprecating `registerFunction(name, f, returnType)` is not acceptable in
Spark 2.x releases.
They still call `registerFunction(name, f)` when `f` is a UDF based on my
above comment. The error will be issued if they specify the mismatched
`returnType`.
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