Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/17286#discussion_r106582563 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala --- @@ -128,38 +131,34 @@ case class CostBasedJoinReorder(conf: CatalystConf) extends Rule[LogicalPlan] wi object JoinReorderDP extends PredicateHelper { def search( - conf: CatalystConf, + conf: SQLConf, items: Seq[LogicalPlan], conditions: Set[Expression], - topOutput: AttributeSet): Option[LogicalPlan] = { + topOutput: AttributeSet): LogicalPlan = { // Level i maintains all found plans for i + 1 items. // Create the initial plans: each plan is a single item with zero cost. - val itemIndex = items.zipWithIndex + val itemIndex = items.zipWithIndex.map(_.swap).toMap --- End diff -- looks like an unnecessary change now
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