Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17286#discussion_r106775016 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala --- @@ -19,31 +19,33 @@ package org.apache.spark.sql.catalyst.optimizer import scala.collection.mutable -import org.apache.spark.sql.catalyst.CatalystConf import org.apache.spark.sql.catalyst.expressions.{And, Attribute, AttributeSet, Expression, PredicateHelper} import org.apache.spark.sql.catalyst.plans.{Inner, InnerLike} import org.apache.spark.sql.catalyst.plans.logical.{BinaryNode, Join, LogicalPlan, Project} import org.apache.spark.sql.catalyst.rules.Rule +import org.apache.spark.sql.internal.SQLConf /** * Cost-based join reorder. * We may have several join reorder algorithms in the future. This class is the entry of these * algorithms, and chooses which one to use. */ -case class CostBasedJoinReorder(conf: CatalystConf) extends Rule[LogicalPlan] with PredicateHelper { +case class CostBasedJoinReorder(conf: SQLConf) extends Rule[LogicalPlan] with PredicateHelper { def apply(plan: LogicalPlan): LogicalPlan = { if (!conf.cboEnabled || !conf.joinReorderEnabled) { plan } else { - val result = plan transform { - case p @ Project(projectList, j @ Join(_, _, _: InnerLike, _)) => - reorder(p, p.outputSet) - case j @ Join(_, _, _: InnerLike, _) => + val result = plan transformDown { + // Start reordering with a joinable item, which is an InnerLike join with conditions. + case j @ Join(_, _, _: InnerLike, Some(cond)) => --- End diff -- I have a very general question about how to exclude cartesian product. See my old PR: #16762 Having a join condition does not mean it is not a Cartesian product. : ) Only having non-equal predicates in join conditions for an inner join. e.g., tab1.a < tab2.b
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