xianyinxin commented on a change in pull request #24983:
[SPARK-27714][SQL][CBO] Support Genetic Algorithm based join reorder
URL: https://github.com/apache/spark/pull/24983#discussion_r308072946
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
##########
@@ -59,11 +60,19 @@ object CostBasedJoinReorder extends Rule[LogicalPlan] with
PredicateHelper {
private def reorder(plan: LogicalPlan, output: Seq[Attribute]): LogicalPlan
= {
val (items, conditions) = extractInnerJoins(plan)
val result =
- // Do reordering if the number of items is appropriate and join
conditions exist.
+ // Do reordering if the join conditions exist.
// We also need to check if costs of all items can be evaluated.
- if (items.size > 2 && items.size <= conf.joinReorderDPThreshold &&
conditions.nonEmpty &&
+ if (items.size > 2 && conditions.nonEmpty &&
items.forall(_.stats.rowCount.isDefined)) {
- JoinReorderDP.search(conf, items, conditions, output)
+ // Reorder with DP when the the number of items is appropriate,
+ // otherwise try GA if it is enabled.
+ if (items.size <= conf.joinReorderDPThreshold) {
+ JoinReorderDP.search(conf, items, conditions, output)
+ } else if (conf.joinReorderGAEnabled) {
+ JoinReorderGA.search(conf, items, conditions, output).getOrElse(plan)
+ } else {
+ plan
+ }
} else {
plan
}
Review comment:
Fixed.
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