Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18732
Ongoing discussions that (I think) might block this PR:
- https://github.com/apache/spark/pull/18732#discussion_r142735696 by
@BryanCutler: `ArrowPandasSerializer` able to serialize pandas.DataFrames
- https://github.com/apache/spark/pull/18732#issuecomment-333065737 by
@viirya: breaking this definition into two (groupping and normal udfs).
- https://github.com/apache/spark/pull/18732#issuecomment-333326073 by
@rxin and answer
https://github.com/apache/spark/pull/18732#issuecomment-333432266 by
@icexelloss: naming suggestion
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