[GitHub] [spark] srowen commented on a change in pull request #26826: [SPARK-30195][SQL][CORE][ML] Change some function, import definitions to work with stricter compiler in Scala 2.13

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srowen commented on a change in pull request #26826: [SPARK-30195][SQL][CORE][ML] Change some function, import definitions to work with stricter compiler in Scala 2.13
URL: https://github.com/apache/spark/pull/26826#discussion_r355826739
 
 

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 File path: mllib/src/main/scala/org/apache/spark/ml/feature/CountVectorizer.scala
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 @@ -215,8 +215,8 @@ class CountVectorizer @Since("1.5.0") (@Since("1.5.0") override val uid: String)
         wc.changeValue(w, 1L, _ + 1L)
       }
       wc.map { case (word, count) => (word, (count, 1)) }
-    }.reduceByKey { case ((wc1, df1), (wc2, df2)) =>
-      (wc1 + wc2, df1 + df2)
+    }.reduceByKey { (wcdf1, wcdf2) =>
 
 Review comment:
   See JIRA for detail on this annoying construction

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