Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/18732#discussion_r141804070 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala --- @@ -47,8 +47,8 @@ import org.apache.spark.sql.types.StructType */ @InterfaceStability.Stable class RelationalGroupedDataset protected[sql]( - df: DataFrame, - groupingExprs: Seq[Expression], + val df: DataFrame, + val groupingExprs: Seq[Expression], --- End diff -- What are these `val` for?
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