Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/11137#issuecomment-186016618
It's because of the problem 1 mentioned in the PR description. Renaming
`DataFrame.map` to `DataFrame.mapRows` is to avoid conflict with `Dataset.map`
since now `DataFrame` extends from `Dataset[Row]`.
Actually I tend to remove these methods and simply resort to `df.rdd.map`
etc.. However, renaming them is more convenient with the help of IDE
refactoring, otherwise I'll have to update the whole codebase manually. Would
like to get everything work first. May remove them later.
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