Github user sethah commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8734#discussion_r50576539
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/mllib/tree/DecisionTreeSuite.scala ---
    @@ -294,8 +295,12 @@ class DecisionTreeSuite extends SparkFunSuite with 
MLlibTestSparkContext {
         assert(topNode.impurity !== -1.0)
     
         // set impurity and predict for child nodes
    -    assert(topNode.leftNode.get.predict.predict === 0.0)
    -    assert(topNode.rightNode.get.predict.predict === 1.0)
    +    if (topNode.leftNode.get.predict.predict === 0.0) {
    --- End diff --
    
    I think now that we are ordering by the correct thing, this change is not 
necessary. Since we order by proportion falling in outcome class 1, the hard 
prediction 0 will always be before hard prediction 1.


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