Github user facaiy commented on a diff in the pull request: https://github.com/apache/spark/pull/17407#discussion_r108320525 --- Diff: mllib/src/test/scala/org/apache/spark/ml/classification/DecisionTreeClassifierSuite.scala --- @@ -385,6 +385,22 @@ class DecisionTreeClassifierSuite testEstimatorAndModelReadWrite(dt, continuousData, allParamSettings ++ Map("maxDepth" -> 0), allParamSettings ++ Map("maxDepth" -> 0), checkModelData) } + + test("SPARK-20043: " + + "ImpurityCalculator builder fails for uppercase impurity type Gini in model read/write") { + val rdd = TreeTests.getTreeReadWriteData(sc) + + val data: DataFrame = + TreeTests.setMetadata(rdd, Map.empty[Int, Int], numClasses = 2) + + val dt = new DecisionTreeClassifier() + .setImpurity("Gini") + .setMaxDepth(2) + + val model = dt.fit(data) + --- End diff -- delete some blank lines to keep compact.
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