brkyvz commented on a change in pull request #27391: [SPARK-30612][SQL] Resolve 
qualified column name with v2 tables
URL: https://github.com/apache/spark/pull/27391#discussion_r373186625
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
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 @@ -780,6 +780,7 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] 
extends Product {
     case exprId: ExprId => true
     case field: StructField => true
     case id: IdentifierWithDatabase => true
+    case alias: AliasIdentifier => true
 
 Review comment:
   why is this change required?

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