Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20330#discussion_r162687347
--- Diff: core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala ---
@@ -18,7 +18,7 @@
package org.apache.spark.ui.jobs
import java.net.URLEncoder
-import java.util.Date
+import java.util.{Collections, Date}
--- End diff --
New import is unused?
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