Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/12217
  
    The tests in `AFTSurvivalRegressionSuite` was being failed. `treeAggregate` 
was being called for AFT cost.
    
    ```
     - aft survival regression: default params
    0.0 equaled 0.0
    ScalaTestFailureLocation: 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$3 at 
(AFTSurvivalRegressionSuite.scala:89)
    org.scalatest.exceptions.TestFailedException: 0.0 equaled 0.0
        at 
org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:500)
        at 
org.scalatest.FunSuite.newAssertionFailedException(FunSuite.scala:1555)
        at 
org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:466)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$3.apply$mcV$sp(AFTSurvivalRegressionSuite.scala:89)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$3.apply(AFTSurvivalRegressionSuite.scala:66)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$3.apply(AFTSurvivalRegressionSuite.scala:66)
        at 
org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
        at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
        at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
        at org.scalatest.Transformer.apply(Transformer.scala:22)
        at org.scalatest.Transformer.apply(Transformer.scala:20)
        at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
        at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:56)
        at 
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
        at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)
        at org.scalatest.FunSuite.runTest(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
        at 
org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
        at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
        at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)
        at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)
        at org.scalatest.Suite$class.run(Suite.scala:1424)
        at 
org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
        at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterAll$$super$run(SparkFunSuite.scala:28)
        at 
org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257)
        at 
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256)
        at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:28)
        at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:55)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2563)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2557)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2557)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)
        at 
org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)
        at 
org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)
        at org.scalatest.tools.Runner$.run(Runner.scala:883)
        at org.scalatest.tools.Runner.run(Runner.scala)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:138)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
    ```
    
    ```
    - aft survival regression with univariate
    0.0 or 1.759 is extremely close to zero, so the relative tolerance is 
meaningless.
    ScalaTestFailureLocation: org.apache.spark.mllib.util.TestingUtils$ at 
(TestingUtils.scala:41)
    org.scalatest.exceptions.TestFailedException: 0.0 or 1.759 is extremely 
close to zero, so the relative tolerance is meaningless.
        at 
org.apache.spark.mllib.util.TestingUtils$.org$apache$spark$mllib$util$TestingUtils$$RelativeErrorComparison(TestingUtils.scala:41)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals$$anonfun$relTol$1.apply(TestingUtils.scala:106)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals$$anonfun$relTol$1.apply(TestingUtils.scala:106)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals.$tilde$eq$eq(TestingUtils.scala:78)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$4.apply$mcV$sp(AFTSurvivalRegressionSuite.scala:162)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$4.apply(AFTSurvivalRegressionSuite.scala:127)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$4.apply(AFTSurvivalRegressionSuite.scala:127)
        at 
org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
        at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
        at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
        at org.scalatest.Transformer.apply(Transformer.scala:22)
        at org.scalatest.Transformer.apply(Transformer.scala:20)
        at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
        at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:56)
        at 
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
        at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)
        at org.scalatest.FunSuite.runTest(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
        at 
org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
        at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
        at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)
        at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)
        at org.scalatest.Suite$class.run(Suite.scala:1424)
        at 
org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
        at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterAll$$super$run(SparkFunSuite.scala:28)
        at 
org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257)
        at 
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256)
        at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:28)
        at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:55)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2563)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2557)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2557)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)
        at 
org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)
        at 
org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)
        at org.scalatest.tools.Runner$.run(Runner.scala:883)
        at org.scalatest.tools.Runner.run(Runner.scala)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:138)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
    ```
    
    ```
    - aft survival regression with multivariate
    0.0 or 1.9206 is extremely close to zero, so the relative tolerance is 
meaningless.
    ScalaTestFailureLocation: org.apache.spark.mllib.util.TestingUtils$ at 
(TestingUtils.scala:41)
    org.scalatest.exceptions.TestFailedException: 0.0 or 1.9206 is extremely 
close to zero, so the relative tolerance is meaningless.
        at 
org.apache.spark.mllib.util.TestingUtils$.org$apache$spark$mllib$util$TestingUtils$$RelativeErrorComparison(TestingUtils.scala:41)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals$$anonfun$relTol$1.apply(TestingUtils.scala:106)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals$$anonfun$relTol$1.apply(TestingUtils.scala:106)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals.$tilde$eq$eq(TestingUtils.scala:78)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$5.apply$mcV$sp(AFTSurvivalRegressionSuite.scala:233)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$5.apply(AFTSurvivalRegressionSuite.scala:196)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$5.apply(AFTSurvivalRegressionSuite.scala:196)
        at 
org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
        at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
        at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
        at org.scalatest.Transformer.apply(Transformer.scala:22)
        at org.scalatest.Transformer.apply(Transformer.scala:20)
        at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
        at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:56)
        at 
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
        at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)
        at org.scalatest.FunSuite.runTest(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
        at 
org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
        at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
        at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)
        at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)
        at org.scalatest.Suite$class.run(Suite.scala:1424)
        at 
org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
        at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterAll$$super$run(SparkFunSuite.scala:28)
        at 
org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257)
        at 
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256)
        at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:28)
        at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:55)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2563)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2557)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2557)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)
        at 
org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)
        at 
org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)
        at org.scalatest.tools.Runner$.run(Runner.scala:883)
        at org.scalatest.tools.Runner.run(Runner.scala)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:138)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
    ```
    
    ```
    - aft survival regression w/o intercept
    0.0 or 0.896 is extremely close to zero, so the relative tolerance is 
meaningless.
    ScalaTestFailureLocation: org.apache.spark.mllib.util.TestingUtils$ at 
(TestingUtils.scala:41)
    org.scalatest.exceptions.TestFailedException: 0.0 or 0.896 is extremely 
close to zero, so the relative tolerance is meaningless.
        at 
org.apache.spark.mllib.util.TestingUtils$.org$apache$spark$mllib$util$TestingUtils$$RelativeErrorComparison(TestingUtils.scala:41)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals$$anonfun$relTol$1.apply(TestingUtils.scala:106)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals$$anonfun$relTol$1.apply(TestingUtils.scala:106)
        at 
org.apache.spark.mllib.util.TestingUtils$DoubleWithAlmostEquals.$tilde$eq(TestingUtils.scala:66)
        at 
org.apache.spark.mllib.util.TestingUtils$VectorWithAlmostEquals$$anonfun$relTol$2$$anonfun$apply$2.apply(TestingUtils.scala:167)
        at 
org.apache.spark.mllib.util.TestingUtils$VectorWithAlmostEquals$$anonfun$relTol$2$$anonfun$apply$2.apply(TestingUtils.scala:167)
        at 
scala.collection.IndexedSeqOptimized$class.prefixLengthImpl(IndexedSeqOptimized.scala:38)
        at 
scala.collection.IndexedSeqOptimized$class.forall(IndexedSeqOptimized.scala:43)
        at scala.collection.mutable.ArrayOps$ofRef.forall(ArrayOps.scala:186)
        at 
org.apache.spark.mllib.util.TestingUtils$VectorWithAlmostEquals$$anonfun$relTol$2.apply(TestingUtils.scala:167)
        at 
org.apache.spark.mllib.util.TestingUtils$VectorWithAlmostEquals$$anonfun$relTol$2.apply(TestingUtils.scala:166)
        at 
org.apache.spark.mllib.util.TestingUtils$VectorWithAlmostEquals.$tilde$eq$eq(TestingUtils.scala:134)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$6.apply$mcV$sp(AFTSurvivalRegressionSuite.scala:304)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$6.apply(AFTSurvivalRegressionSuite.scala:266)
        at 
org.apache.spark.ml.regression.AFTSurvivalRegressionSuite$$anonfun$6.apply(AFTSurvivalRegressionSuite.scala:266)
        at 
org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
        at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
        at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
        at org.scalatest.Transformer.apply(Transformer.scala:22)
        at org.scalatest.Transformer.apply(Transformer.scala:20)
        at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
        at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:56)
        at 
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
        at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
        at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)
        at org.scalatest.FunSuite.runTest(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
        at 
org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
        at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
        at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)
        at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)
        at org.scalatest.Suite$class.run(Suite.scala:1424)
        at 
org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
        at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
        at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterAll$$super$run(SparkFunSuite.scala:28)
        at 
org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257)
        at 
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256)
        at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:28)
        at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:55)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2563)
        at 
org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$3.apply(Runner.scala:2557)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2557)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)
        at 
org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)
        at 
org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)
        at 
org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)
        at org.scalatest.tools.Runner$.run(Runner.scala:883)
        at org.scalatest.tools.Runner.run(Runner.scala)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:138)
        at 
org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
    ```
    
    Let me give a shot to provide a minimal reproduction.


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