Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19363#discussion_r144753122
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -465,6 +466,19 @@ class RelationalGroupedDataset protected[sql](
Dataset.ofRows(df.sparkSession, plan)
}
+
+ override def toString: String = {
+ val builder = new StringBuilder
+ builder.append("RelationalGroupedDataset: [groupingBy: [")
--- End diff --
`groupingBy` -> `group by`
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