Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19363#discussion_r144753090
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -21,6 +21,7 @@ import java.util.Locale
import scala.collection.JavaConverters._
import scala.language.implicitConversions
+import scala.util.control.NonFatal
--- End diff --
ditto
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