dongjoon-hyun commented on a change in pull request #29111:
URL: https://github.com/apache/spark/pull/29111#discussion_r454639188
##########
File path: mllib/src/main/scala/org/apache/spark/ml/Estimator.scala
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@@ -26,7 +27,7 @@ import org.apache.spark.sql.Dataset
/**
* Abstract class for estimators that fit models to data.
*/
-abstract class Estimator[M <: Model[M]] extends PipelineStage {
+abstract class Estimator[M <: Model[M] : ClassTag] extends PipelineStage {
Review comment:
Unfortunately, MiMi seems to complain on this and a few others like this.
```
[error] * method this()Unit in class org.apache.spark.ml.Estimator does not
have a correspondent in current version
4232
[error] filter with:
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.ml.Estimator.this")
4233
[error] * method this()Unit in class org.apache.spark.ml.Predictor does not
have a correspondent in current version
4234
[error] filter with:
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.ml.Predictor.this")
4235
[error] * method this()Unit in class
org.apache.spark.ml.classification.ProbabilisticClassifier does not have a
correspondent in current version
4236
[error] filter with:
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.ml.classification.ProbabilisticClassifier.this")
4237
[error] * method this()Unit in class
org.apache.spark.ml.classification.Classifier does not have a correspondent in
current version
4238
[error] filter with:
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.ml.classification.Classifier.this")
```
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