Github user mpjlu commented on the issue: https://github.com/apache/spark/pull/18832 parentStats is used in this code:ãbinAggregates.getParentImpurityCalculator(), this is used in all iteration. So that comment seems very misleading. `} else if (binAggregates.metadata.isUnordered(featureIndex)) { // Unordered categorical feature val leftChildOffset = binAggregates.getFeatureOffset(featureIndexIdx) val (bestFeatureSplitIndex, bestFeatureGainStats) = Range(0, numSplits).map { splitIndex => val leftChildStats = binAggregates.getImpurityCalculator(leftChildOffset, splitIndex) val rightChildStats = binAggregates.getParentImpurityCalculator() .subtract(leftChildStats) gainAndImpurityStats = calculateImpurityStats(gainAndImpurityStats, leftChildStats, rightChildStats, binAggregates.metadata) (splitIndex, gainAndImpurityStats) }.maxBy(_._2.gain) (splits(featureIndex)(bestFeatureSplitIndex), bestFeatureGainStats) }`
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