[GitHub] [spark] amaliujia commented on a diff in pull request #42971: [SPARK-43979][SQL][FOLLOWUP] Handle non alias-only project case

["amaliujia (via GitHub)" <gi...@apache.org>]

amaliujia commented on code in PR #42971:
URL: https://github.com/apache/spark/pull/42971#discussion_r1328287335


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala:
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@@ -1131,17 +1130,24 @@ trait CheckAnalysis extends PredicateHelper with LookupCatalog with QueryErrorsB
    * remove extra project which only re-assign expr ids from the plan so that we can identify exact
    * duplicates metric definition.
    */
-  private def simplifyPlanForCollectedMetrics(plan: LogicalPlan): LogicalPlan = {
+  def simplifyPlanForCollectedMetrics(plan: LogicalPlan): LogicalPlan = {
     plan.resolveOperators {
       case p: Project if p.projectList.size == p.child.output.size =>
-        val assignExprIdOnly = p.projectList.zipWithIndex.forall {
+        var assignExprIdOnly = p.projectList.zipWithIndex.forall {
           case (Alias(attr: AttributeReference, _), index) =>
             // The input plan of this method is already canonicalized. The attribute id becomes the
             // ordinal of this attribute in the child outputs. So an alias-only Project means the
             // the id of the aliased attribute is the same as its index in the project list.
             attr.exprId.id == index
           case _ => false

Review Comment:
   Actual it is not. Because `Alias` is not `Attribute`, we will miss the `Alias` case match. 
   
   



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