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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