Github user hhbyyh commented on a diff in the pull request: https://github.com/apache/spark/pull/17407#discussion_r108094114 --- Diff: mllib/src/test/scala/org/apache/spark/ml/regression/DecisionTreeRegressorSuite.scala --- @@ -178,6 +178,22 @@ class DecisionTreeRegressorSuite TreeTests.allParamSettings ++ Map("maxDepth" -> 0), TreeTests.allParamSettings ++ Map("maxDepth" -> 0), checkModelData) } + + test("SPARK-20043: " + + "ImpurityCalculator builder fails for uppercase impurity type in model read/write") { + val rdd = TreeTests.getTreeReadWriteData(sc) + + val data: DataFrame = + TreeTests.setMetadata(rdd, Map.empty[Int, Int], numClasses = 0) + + val dt = new DecisionTreeRegressor() + .setImpurity("Variance") + .setMaxDepth(2) + + val model = dt.fit(data) + --- End diff -- the second unit test seems redundant for this case.
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