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Add doc about transform https://github.com/apache/spark/pull/30973#issuecomment-753715318
[Github] Pull Request #31010 (AngersZhuuuu)
[Github] Pull Request #32257 (AngersZhuuuu)
[Github] Pull Request #32375 (AngersZhuuuu)
[Github] Pull Request #32376 (AngersZhuuuu)