Github user petermaxlee commented on a diff in the pull request:
https://github.com/apache/spark/pull/13989#discussion_r69075198
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -265,6 +265,11 @@ abstract class LogicalPlan extends
QueryPlan[LogicalPlan] with Logging {
s"Reference '$name' is ambiguous, could be: $referenceNames.")
}
}
+
+ /**
+ * Invalidates any metadata cached in the plan recursively.
+ */
+ def refresh(): Unit = children.foreach(_.refresh())
--- End diff --
I don't get it. Why would this be more expensive than any other recursive
calls that happen in logical plans?
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