maryannxue commented on a change in pull request #23759: [SPARK-26840][SQL]
Avoid cost-based join reorder in presence of join hints
URL: https://github.com/apache/spark/pull/23759#discussion_r256045879
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
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@@ -77,12 +77,12 @@ object CostBasedJoinReorder extends Rule[LogicalPlan] with
PredicateHelper {
*/
private def extractInnerJoins(plan: LogicalPlan): (Seq[LogicalPlan],
Set[Expression]) = {
plan match {
- case Join(left, right, _: InnerLike, Some(cond), _) =>
+ case Join(left, right, _: InnerLike, Some(cond), JoinHint.NONE) =>
val (leftPlans, leftConditions) = extractInnerJoins(left)
val (rightPlans, rightConditions) = extractInnerJoins(right)
(leftPlans ++ rightPlans, splitConjunctivePredicates(cond).toSet ++
leftConditions ++ rightConditions)
- case Project(projectList, j @ Join(_, _, _: InnerLike, Some(cond), _))
+ case Project(projectList, j @ Join(_, _, _: InnerLike, Some(cond),
JoinHint.NONE))
Review comment:
It would still be correct without this line of change, but I think it's more
efficient that way.
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