Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18600#discussion_r126884475
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala ---
@@ -72,11 +72,6 @@ abstract class SparkPlan extends QueryPlan[SparkPlan]
with Logging with Serializ
}
/**
- * @return Metadata that describes more details of this SparkPlan.
- */
- def metadata: Map[String, String] = Map.empty
--- End diff --
We introduced `metadata` to work around the equality issue of data source
scan. Now it's fixed, and we can remove it.
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