zhengruifeng commented on issue #26803: [SPARK-30178][ML] RobustScaler support large numFeatures URL: https://github.com/apache/spark/pull/26803#issuecomment-566419509 Moreover, for existing impl, we can use `reduceByKey`/`aggregateByKey` with feature index as a key to generate a `RDD[QuantileSummaries]` and then compute and fetch the range/median instead of the large `Array[QuantileSummaries]`, as @srowen suggested.
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