viirya commented on a change in pull request #23908:  [SPARK-27001][SQL] 
Refactor "serializerFor" method between ScalaReflection and JavaTypeInference
URL: https://github.com/apache/spark/pull/23908#discussion_r261057824
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/DeserializerBuildHelper.scala
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 @@ -39,40 +39,38 @@ object DeserializerBuildHelper {
       path: Expression,
       ordinal: Int,
       dataType: DataType,
-      walkedTypePath: Seq[String]): Expression = {
+      walkedTypePath: WalkedTypePath): Expression = {
     val newPath = GetStructField(path, ordinal)
     upCastToExpectedType(newPath, dataType, walkedTypePath)
   }
 
   def deserializerForWithNullSafety(
 
 Review comment:
   I didn't notice you also make a lot change to `DeserializerBuildHelper` in 
this PR.  There might be conflicts if continuing #23916, I will close it.

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