Github user viirya commented on the issue:
https://github.com/apache/spark/pull/20217
> Like other people mentioned before, it's really confusing to have so many
ways to register a UDF in PySpark, while Java/Scala API is cleaner.
I agree with it. When I looked at this change, I have a thought why
there're many ways to do it. And seems it is inconsistent that we have
`registerFunction` in `Catalog` and `SQLContext`, but in `UDFRegistration` we
have `register`.
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