Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/22353#discussion_r216380605
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala ---
@@ -73,6 +73,11 @@ abstract class SparkPlan extends QueryPlan[SparkPlan]
with Logging with Serializ
super.makeCopy(newArgs)
}
+ /**
+ * @return Metadata that describes more details of this SparkPlan.
+ */
+ def metadata: Map[String, String] = Map.empty
+
--- End diff --
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