Github user zjffdu commented on the pull request:
https://github.com/apache/spark/pull/9766#issuecomment-175370257
Thanks @holdenk for review this. One scenario is that the udf function has
already been implemented in java, user don't need to wrap it using py4j and
register it as python udf. This might be valuable when one company has its own
udf repository, they can just implement each udf using one language
(java/python) and its pyspark user can just register the UDF without wrap it
using py4j.
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