Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18732#discussion_r142836245 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/object.scala --- @@ -519,3 +519,18 @@ case class CoGroup( outputObjAttr: Attribute, left: LogicalPlan, right: LogicalPlan) extends BinaryNode with ObjectProducer + +case class FlatMapGroupsInPandas( + groupingAttributes: Seq[Attribute], + functionExpr: Expression, + output: Seq[Attribute], + child: LogicalPlan) extends UnaryNode { + /** + * This is needed because output attributes is considered `reference` when --- End diff -- nit: `reference` -> `references`.
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