mgaido91 commented on a change in pull request #25204:
[SPARK-28441][SQL][Python] Fix error when non-foldable expression is used in
correlated scalar subquery
URL: https://github.com/apache/spark/pull/25204#discussion_r307183296
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -650,7 +650,9 @@ object ColumnPruning extends Rule[LogicalPlan] {
*/
private def removeProjectBeforeFilter(plan: LogicalPlan): LogicalPlan = plan
transformUp {
case p1 @ Project(_, f @ Filter(_, p2 @ Project(_, child)))
- if p2.outputSet.subsetOf(child.outputSet) =>
+ if p2.outputSet.subsetOf(child.outputSet) &&
+ // We only remove attribute-only project.
+ p2.projectList.forall(_.isInstanceOf[AttributeReference]) =>
Review comment:
I am not sure about this change. This may cause serious perf regression
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