amaliujia commented on code in PR #41123:
URL: https://github.com/apache/spark/pull/41123#discussion_r1190436250


##########
common/utils/src/main/scala/org/apache/spark/util/JsonUtils.scala:
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@@ -25,9 +25,9 @@ import 
com.fasterxml.jackson.databind.{DeserializationFeature, ObjectMapper}
 import com.fasterxml.jackson.module.scala.DefaultScalaModule
 
 
-private[spark] object JsonUtils {
+private[spark] trait JsonUtils {
 
-  private val mapper = new ObjectMapper().registerModule(DefaultScalaModule)
+  protected val mapper = new ObjectMapper().registerModule(DefaultScalaModule)

Review Comment:
   @LuciferYang which type annotation you are referring to? Can you share an 
example?



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