zhengruifeng opened a new pull request #27040: [SPARK-30380][ML] Refactor RandomForest.findSplits URL: https://github.com/apache/spark/pull/27040 ### What changes were proposed in this pull request? Refactor `RandomForest.findSplits` by applying `aggregateByKey` instead of `groupByKey` ### Why are the changes needed? Current impl of `RandomForest.findSplits` uses `groupByKey` to collect non-zero values for each feature, so it is quite dangerous. After looking into the following logic to obtain splits, I found that collecting all non-zero values are not needed, and we only need weightSums for all distinct values. ### Does this PR introduce any user-facing change? No ### How was this patch tested? existing testsuites
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