Implement DataFrame.apply
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core
dataframe
dsl
improvement
P3
python
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- Java
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Description
https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.apply.html
We may need to go to singleton partitioning for axis=0 case. For either axis case we will need to infer the return type of the function in order to generate a correct proxy.
Imported from Jira [BEAM-11630](https://issues.apache.org/jira/browse/BEAM-11630). Original Jira may contain additional context.
Reported by: bhulette.
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