cloud-fan commented on code in PR #51046:
URL: https://github.com/apache/spark/pull/51046#discussion_r2375370533
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -411,6 +411,18 @@ abstract class Optimizer(catalogManager: CatalogManager)
s.withNewPlan(
if (needTopLevelProject) newPlan else newPlan.child
)
+ case s: Exists =>
+ // Find all the references (columns / attributes) in the child plan
that are needed
+ // by the EXISTS expression.
+ val selectedRefrences =
+ s.plan.output.filter(s.joinCond.flatMap(_.references).contains)
+ val projectOverChild = Project(selectedRefrences, s.plan)
+ val Subquery(newPlan, _) =
+
Optimizer.this.execute(Subquery.fromExpression(s.withNewPlan(projectOverChild)))
+ // At this point we have an optimized subquery plan that we are going
to attach
+ // to this subquery expression. Here we can safely remove any top
level sort
+ // in the plan as tuples produced by a subquery are un-ordered.
+ s.withNewPlan(removeTopLevelSort(newPlan))
Review Comment:
nit: can we create a util function to do this and save duplicated code?
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