cloud-fan commented on a change in pull request #29389:
URL: https://github.com/apache/spark/pull/29389#discussion_r467682881
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/BroadcastExchangeExec.scala
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@@ -126,6 +128,9 @@ case class BroadcastExchangeExec(
val relation = mode.transform(input, Some(numRows))
val dataSize = relation match {
+ case EmptyHashedRelation =>
+ knownRowCount = Some(0L)
Review comment:
See L118. We already know the row count and we even use it to check
`numRows >= MAX_BROADCAST_TABLE_ROWS`
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