Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/17546#discussion_r111058094 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala --- @@ -54,8 +54,6 @@ case class CostBasedJoinReorder(conf: SQLConf) extends Rule[LogicalPlan] with Pr private def reorder(plan: LogicalPlan, output: Seq[Attribute]): LogicalPlan = { val (items, conditions) = extractInnerJoins(plan) - // TODO: Compute the set of star-joins and use them in the join enumeration - // algorithm to prune un-optimal plan choices. --- End diff -- do we have a plan to completely merge these 2 rules?
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