Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19363#discussion_r144753076
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/KeyValueGroupedDataset.scala ---
@@ -18,13 +18,13 @@
package org.apache.spark.sql
import scala.collection.JavaConverters._
+import scala.util.control.NonFatal
--- End diff --
unnecessary import
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