AngersZhuuuu 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_r345621281
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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.
For correlated exists, it will be changed to a `join`, add `Project(Nil,
...)` in `OptimizeSubqueries ` will break the column reference.
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