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[SPARK-22451][ML] Reduce decision tree aggregate size for unordered features from O(2^numCategories) to O(numCategories) #19666

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WeichenXu123 wants to merge 2 commits into from

add unit test

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[SPARK-22451][ML] Reduce decision tree aggregate size for unordered features from O(2^numCategories) to O(numCategories) #19666

add unit test
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