Github user WeichenXu123 commented on a diff in the pull request: https://github.com/apache/spark/pull/20964#discussion_r178784391 --- Diff: mllib/src/test/scala/org/apache/spark/ml/feature/NGramSuite.scala --- @@ -84,7 +84,7 @@ class NGramSuite extends MLTest with DefaultReadWriteTest { def testNGram(t: NGram, dataFrame: DataFrame): Unit = { testTransformer[(Seq[String], Seq[String])](dataFrame, t, "nGrams", "wantedNGrams") { - case Row(actualNGrams : Seq[String], wantedNGrams: Seq[String]) => + case Row(actualNGrams : Seq[_], wantedNGrams: Seq[_]) => --- End diff -- Just curious, why change `Seq[String]` to `Seq[_]`, is it for fixing some potential issue ?
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