Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/20806
@viirya ok. but there're already a class in ML use
`TypedImperativeAggregator`, see `Summarizer`.
And do you benchmark and compare this PR and `df.rdd.treeAggregate`?
Seems they're almost the same. Is there some difference which can make
remarkable performance improvement ?
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