Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16175#discussion_r91541946
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala ---
@@ -115,7 +115,8 @@ abstract class SparkStrategies extends
QueryPlanner[SparkPlan] {
*/
private def canBroadcast(plan: LogicalPlan): Boolean = {
plan.statistics.isBroadcastable ||
- plan.statistics.sizeInBytes <= conf.autoBroadcastJoinThreshold
+ (plan.statistics.sizeInBytes >= 0 &&
--- End diff --
will negative `sizeInBytes` lead to other serious problems? If so, we may
need to add an assert in `Statistics` to make sure `sizeInBytes` is >= 0
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