Fokko commented on a change in pull request #26644: [SPARK-30004][SQL] Allow 
merge UserDefinedType into a native DataType
URL: https://github.com/apache/spark/pull/26644#discussion_r349908533
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala
 ##########
 @@ -592,6 +592,9 @@ object StructType extends AbstractDataType {
       case (leftUdt: UserDefinedType[_], rightUdt: UserDefinedType[_])
         if leftUdt.userClass == rightUdt.userClass => leftUdt
 
+      case (leftType, rightUdt: UserDefinedType[_])
 
 Review comment:
   I've added a Scaladoc to the private merge function. I think the Javadoc 
that you're pointing to, is describing the function at a different level. For 
example, it doesn't mention any UDT's at all. Let me know what you think.

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