zhengruifeng commented on pull request #29018:
URL: https://github.com/apache/spark/pull/29018#issuecomment-658066066

   @viirya Thanks for reviewing!
   > This win only happens when maxBins is less
   Yes, but in most cases, maxBin(default=32) < 128
   > the perf regression happens for all cases
   Yes, I think so.
   > I'm also not sure how often memory is an issue when training the model
   It will make sense if there is no enough memory for orginal 
treePoint(Array[Int]). I personally think it maybe worthwhile if the regression 
is small enough, but I am not sure whether current performance results are OK.

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