LuciferYang commented on a change in pull request #30441:
URL: https://github.com/apache/spark/pull/30441#discussion_r527473631
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File path: core/src/main/scala/org/apache/spark/SparkContext.scala
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@@ -27,6 +27,7 @@ import scala.collection.JavaConverters._
import scala.collection.Map
import scala.collection.immutable
import scala.collection.mutable.HashMap
+import scala.collection.mutable.HashSet
Review comment:
Expect this line to trigger compile error
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