Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/17546#discussion_r111098412 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala --- @@ -327,3 +349,109 @@ object JoinReorderDP extends PredicateHelper with Logging { case class Cost(card: BigInt, size: BigInt) { def +(other: Cost): Cost = Cost(this.card + other.card, this.size + other.size) } + +/** + * Implements optional filters to reduce the search space for join enumeration. + * + * 1) Star-join filters: Plan star-joins together since they are assumed + * to have an optimal execution based on their RI relationship. + * 2) Cartesian products: Defer their planning later in the graph to avoid --- End diff -- We already have this logic in the dp join reorder algorithm.
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