Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/13418#discussion_r65441184 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -1468,7 +1468,8 @@ object DecimalAggregates extends Rule[LogicalPlan] { */ object ConvertToLocalRelation extends Rule[LogicalPlan] { def apply(plan: LogicalPlan): LogicalPlan = plan transform { - case Project(projectList, LocalRelation(output, data)) => + case p @ Project(projectList, LocalRelation(output, data)) + if !p.expressions.exists(ScalarSubquery.hasScalarSubquery) => --- End diff -- I think AttributeReference is the only exception, it will be replaced to BoundReference when create an Projection, we could have a special case for that.
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