Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/17278#discussion_r105770937
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -140,7 +140,8 @@ abstract class Optimizer(sessionCatalog:
SessionCatalog, conf: CatalystConf)
object OptimizeSubqueries extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan
transformAllExpressions {
case s: SubqueryExpression =>
- s.withNewPlan(Optimizer.this.execute(s.plan))
+ val ReturnAnswer(newPlan) =
Optimizer.this.execute(ReturnAnswer(s.plan))
--- End diff --
Lemme try a more conservative approach (also better for backporting).
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