Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15363#discussion_r105966018
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
 ---
    @@ -51,6 +51,11 @@ case class CostBasedJoinReorder(conf: CatalystConf) 
extends Rule[LogicalPlan] wi
     
       def reorder(plan: LogicalPlan, output: AttributeSet): LogicalPlan = {
         val (items, conditions) = extractInnerJoins(plan)
    +    // Find the star schema joins. Currently, it returns the star join 
with the largest
    +    // fact table. In the future, it can return more than one star join 
(e.g. F1-D1-D2
    +    // and F2-D3-D4).
    +    val starJoinPlans = StarSchemaDetection(conf).findStarJoins(items, 
conditions.toSeq)
    --- End diff --
    
    @ioana-delaney Please comment it out and leave it as a TODO item. Thanks!


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