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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