leanken commented on a change in pull request #29389:
URL: https://github.com/apache/spark/pull/29389#discussion_r467690876



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/BroadcastExchangeExec.scala
##########
@@ -82,6 +82,8 @@ case class BroadcastExchangeExec(
     "buildTime" -> SQLMetrics.createTimingMetric(sparkContext, "time to 
build"),
     "broadcastTime" -> SQLMetrics.createTimingMetric(sparkContext, "time to 
broadcast"))
 
+  private var knownRowCount: Option[BigInt] = None

Review comment:
       Sure will do the update.




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