cloud-fan commented on a change in pull request #26437: [SPARK-29800][SQL] Plan
non-correlated Exists 's subquery in PlanSubqueries
URL: https://github.com/apache/spark/pull/26437#discussion_r345613479
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
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@@ -194,6 +258,9 @@ case class PlanSubqueries(sparkSession: SparkSession)
extends Rule[SparkPlan] {
}
val executedPlan = new QueryExecution(sparkSession, query).executedPlan
InSubqueryExec(expr, SubqueryExec(s"subquery#${exprId.id}",
executedPlan), exprId)
+ case expressions.Exists(sub, children, exprId) =>
+ val executedPlan = new QueryExecution(sparkSession, Project(Nil,
sub)).executedPlan
Review comment:
Isn't it useful for correlated EXISTS as well? logically it's always valid
to prune all columns from EXISTS subquery, no matter it's correlated or not.
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