SaurabhChawla100 commented on a change in pull request #32972:
URL: https://github.com/apache/spark/pull/32972#discussion_r656492761



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveUnion.scala
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@@ -182,6 +182,15 @@ object ResolveUnion extends Rule[LogicalPlan] {
             // union have consistent schema.
             aliased += foundAttr
             Alias(addFields(foundAttr, target), foundAttr.name)()
+          case (source: StructType, target: StructType)

Review comment:
       this handled in the code where each of the left attribute it adds its 
corresponding right side 
   
   ```
    val rightProjectList = leftOutputAttrs.map { lattr =>
         val found = rightOutputAttrs.find { rattr => resolver(lattr.name, 
rattr.name) }
         if (found.isDefined) {
   ```




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