cloud-fan commented on a change in pull request #28947:
URL: https://github.com/apache/spark/pull/28947#discussion_r448173490
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
##########
@@ -286,6 +283,36 @@ case class OptimizeSkewedJoin(conf: SQLConf) extends
Rule[SparkPlan] {
plan
}
}
+
+ override def apply(plan: SparkPlan): SparkPlan = {
+ if (!conf.getConf(SQLConf.SKEW_JOIN_ENABLED)) {
+ return plan
+ }
+
+ // Try to handle skew join with union case, like
Review comment:
For 3-table join, if they are in the same query stage, it means the
shuffles are all leaf, and we will only optimize the first SMJ, as the second
SMJ has only one side as shuffle stage.
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