cloud-fan commented on a change in pull request #28947:
URL: https://github.com/apache/spark/pull/28947#discussion_r448172830
##########
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:
Can we make it more general? It seems like we can optimize any SMJ if
its 2 children are both shuffle stages. cc @JkSelf @maryannxue
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