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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