Github user zjffdu commented on the pull request:
https://github.com/apache/spark/pull/9766#issuecomment-178472510
Do you mean wrapping java/scala UDF using python and call it through py4j ?
One concern is the performance, because in this way we still need to launch
python process. And if you already have java/scala UDF why not register it
directly in python (what this ticket is doing) and call it using data frame
api.
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