cloud-fan commented on a change in pull request #23057: [SPARK-26078][SQL]
Dedup self-join attributes on IN subqueries
URL: https://github.com/apache/spark/pull/23057#discussion_r241477432
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
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@@ -43,31 +43,44 @@ import org.apache.spark.sql.types._
* condition.
*/
object RewritePredicateSubquery extends Rule[LogicalPlan] with PredicateHelper
{
- private def dedupJoin(joinPlan: LogicalPlan): LogicalPlan = joinPlan match {
+
+ private def buildJoin(
+ outerPlan: LogicalPlan,
+ subplan: LogicalPlan,
+ joinType: JoinType,
+ condition: Option[Expression]): Join = {
+ // Deduplicate conflicting attributes if any.
+ val dedupSubplan = dedupSubqueryOnSelfJoin(outerPlan, subplan)
+ Join(outerPlan, dedupSubplan, joinType, condition)
Review comment:
we need to refactor the code a little bit
```
...
val duplicates = outerRefs.intersect(subplan.outputSet)
condition.foreach {
case a: Attribute if duplicates.contains(a) => fail
case _ =>
}
...
```
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