[GitHub] [spark] gengliangwang commented on a diff in pull request #39732: [SPARK-42178][UI] Handle remaining null string values in ui protobuf serializer and add tests

["gengliangwang (via GitHub)" <gi...@apache.org>]

gengliangwang commented on code in PR #39732:
URL: https://github.com/apache/spark/pull/39732#discussion_r1086223751


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core/src/test/scala/org/apache/spark/status/protobuf/KVStoreProtobufSerializerSuite.scala:
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@@ -31,6 +34,32 @@ import org.apache.spark.ui.scope.{RDDOperationEdge, RDDOperationNode}
 class KVStoreProtobufSerializerSuite extends SparkFunSuite {
   private val serializer = new KVStoreProtobufSerializer()
 
+  test("All the string fields must be optional to avoid NPE") {

Review Comment:
   This test checks the protobuf file to make sure all the string fields are defined as `optional string`



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