Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19363#discussion_r144873610 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala --- @@ -1341,8 +1341,69 @@ class DatasetSuite extends QueryTest with SharedSQLContext { Seq(1).toDS().map(_ => ("", TestForTypeAlias.seqOfTupleTypeAlias)), ("", Seq((1, 1), (2, 2)))) } + + test("Check RelationalGroupedDataset toString: Single data") { + val kvDataset = (1 to 3).toDF("id").groupBy("id") + val expected = "RelationalGroupedDataset: [" + + "group by: [id: int], value: [id: int], type: GroupByType]" --- End diff -- a better idea: * `group by` -> `grouping expressions` * `type: GroupByType` -> `type: GroupBy`, i.e. remove the `Type` suffix.
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