[GitHub] [spark] AngersZhuuuu commented on a diff in pull request #36477: [SPARK-39120][SQL] Prunes the duplicate columns from child of UnaryNode

[GitBox <gi...@apache.org>]

AngersZhuuuu commented on code in PR #36477:
URL: https://github.com/apache/spark/pull/36477#discussion_r867590079


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -855,6 +855,15 @@ object ColumnPruning extends Rule[LogicalPlan] {
     case e @ Expand(_, _, child) if !child.outputSet.subsetOf(e.references) =>
       e.copy(child = prunedChild(child, e.references))
 
+    // Prunes the duplicate columns from child of UnaryNode, e.g.: Aggregate
+    case p: UnaryNode
+      if p.child.isInstanceOf[Project] && p.child.output.size > p.child.outputSet.size =>

Review Comment:
   Here should exclude script transform.



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