cloud-fan commented on a change in pull request #32832:
URL: https://github.com/apache/spark/pull/32832#discussion_r659948827



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -424,6 +424,12 @@ class Analyzer(override val catalogManager: CatalogManager)
    */
   object ResolveAliases extends Rule[LogicalPlan] {
     private def assignAliases(exprs: Seq[NamedExpression]) = {
+      def extractOnly(e: Expression): Boolean = e match {
+        case _: ExtractValue => e.children.forall(extractOnly)
+        case _: Literal => true

Review comment:
       since we allow literal here, maybe we should allow it in the non 
`ExtractValue` case as well

##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -424,6 +424,12 @@ class Analyzer(override val catalogManager: CatalogManager)
    */
   object ResolveAliases extends Rule[LogicalPlan] {
     private def assignAliases(exprs: Seq[NamedExpression]) = {
+      def extractOnly(e: Expression): Boolean = e match {
+        case _: ExtractValue => e.children.forall(extractOnly)
+        case _: Literal => true

Review comment:
       or maybe we shouldn't allow literal here either




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