viirya commented on a change in pull request #26509: [SPARK-29427][SQL] Add API
to convert RelationalGroupedDataset to KeyValueGroupedDataset
URL: https://github.com/apache/spark/pull/26509#discussion_r346391189
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File path:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala
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@@ -46,11 +47,13 @@ import org.apache.spark.sql.types.{NumericType, StructType}
* @since 2.0.0
*/
@Stable
-class RelationalGroupedDataset protected[sql](
- private[sql] val df: DataFrame,
+class RelationalGroupedDataset[T] protected[sql](
Review comment:
@dongjoon-hyun > Do we need this change for your original goal, Add API ...?
To change from df: DataFrame to ds: Dataset[T] is because we need the typed
information. For DataFrame, we have no idea about original object type.
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