Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/18732#discussion_r142523671
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -47,7 +47,7 @@ import org.apache.spark.sql.types.StructType
*/
@InterfaceStability.Stable
class RelationalGroupedDataset protected[sql](
- df: DataFrame,
+ val df: DataFrame,
--- End diff --
I don't think this needs to be a `val`
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