Github user AnthonyTruchet commented on the issue: https://github.com/apache/spark/pull/16038 Maybe we could have a live talk/chat this evening Paris time / Morning West Coast time? If I'm not mistaken both #16037 and this change fix the issue at two different levels. * #16037 consider the the is specific to ML and that we can & should work around it in MLlib * This change consider the root cause is an inefficiency of treeAggregate in core whose fix would enable a better fix in MLlib. I updated this PR to reflect this. I might have misunderstood your comment https://github.com/apache/spark/pull/15905#pullrequestreview-8844854
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