Seth Hendrickson resolved SPARK-3159.
       Resolution: Fixed
    Fix Version/s: 2.4.0

> Check for reducible DecisionTree
> --------------------------------
>                 Key: SPARK-3159
>                 URL: https://issues.apache.org/jira/browse/SPARK-3159
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Joseph K. Bradley
>            Priority: Minor
>             Fix For: 2.4.0
> Improvement: test-time computation
> Currently, pairs of leaf nodes with the same parent can both output the same 
> prediction.  This happens since the splitting criterion (e.g., Gini) is not 
> the same as prediction accuracy/MSE; the splitting criterion can sometimes be 
> improved even when both children would still output the same prediction 
> (e.g., based on the majority label for classification).
> We could check the tree and reduce it if possible after training.
> Note: This happens with scikit-learn as well.

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