Github user NarineK commented on a diff in the pull request:
https://github.com/apache/spark/pull/12836#discussion_r62951293
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/r/MapPartitionsRWrapper.scala
---
@@ -25,6 +25,21 @@ import org.apache.spark.sql.Row
import org.apache.spark.sql.types.{BinaryType, StructField, StructType}
/**
+ * A function wrapper that applies the given R function to each partition
of each group.
+ */
+private[sql] case class MapGroupsRWrapper(
--- End diff --
gapply for mutiple columns with RelationalGroupedDataset -> flatMap ...
seems to work fine.
Will address other comments and push the changes any time soon.
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