Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/8662#issuecomment-140930587
Hye @davies - I was not involved with Python UDFs earlier, but why does
calling udfs require caching? Isn't it really bad if the partition is large?
It doesn't make a lot of sense to me that we would need to materialize the
entire partition of data for calling UDFs.
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