BryanCutler commented on issue #24896: [WIP][SPARK-28006] User-defined grouped 
transform pandas_udf for window operations
   @icexelloss I'm a little confused about a couple things
   1) is this specific to operations over a window only?
   2) can the same functionality be achieved by the `GROUPED_MAP` pandas_udf, 
only it is slower and awkward because it requires the whole dataframe even 
though only 1 column is used?

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