Github user icexelloss commented on the issue:
https://github.com/apache/spark/pull/19505
@viirya @cloud-fan I updated my original summary. I think it answers
`group_transform` question. I also added more example to each type.
@HyukjinKwon @viirya I agree we can move this to a separate Jira and merge
current PR of @ueshin. Maybe I can open another PR with just the proposal
design doc? Not sure what's the best way is.
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