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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