HyukjinKwon edited a comment on issue #24997: [SPARK-28198][PYTHON] Add mapPartitionsInPandas to allow an iterator of DataFrames URL: https://github.com/apache/spark/pull/24997#issuecomment-506926878 Ah, yes. That seems working - I gotta fix the example in PR description. I actually want to do something like what [`DataFrame.apply`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.apply.html) too (not [`DataFrame.transform`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.transform.html) which guarantees the same length), for instance. Let me fix the example later tonight.
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