fix mima

Author: WeichenXu123

project/MimaExcludes.scala

@@ -68,7 +68,11 @@ object MimaExcludes {
 
     // [SPARK-14280] Support Scala 2.12
     ProblemFilters.exclude[ReversedMissingMethodProblem]("org.apache.spark.FutureAction.transformWith"),
-    ProblemFilters.exclude[ReversedMissingMethodProblem]("org.apache.spark.FutureAction.transform")
+    ProblemFilters.exclude[ReversedMissingMethodProblem]("org.apache.spark.FutureAction.transform"),
+
+    // [SPARK-21087] CrossValidator, TrainValidationSplit expose sub models after fitting: Scala
+    ProblemFilters.exclude[FinalClassProblem]("org.apache.spark.ml.tuning.CrossValidatorModel$CrossValidatorModelWriter"),
+    ProblemFilters.exclude[FinalClassProblem]("org.apache.spark.ml.tuning.TrainValidationSplitModel$TrainValidationSplitModelWriter")
   )
 
   // Exclude rules for 2.2.x