YannByron commented on a change in pull request #4565:
URL: https://github.com/apache/hudi/pull/4565#discussion_r785604585



##########
File path: 
hudi-spark-datasource/hudi-spark-common/src/main/scala/org/apache/hudi/HoodieMergeOnReadRDD.scala
##########
@@ -54,15 +54,20 @@ class HoodieMergeOnReadRDD(@transient sc: SparkContext,
   private val preCombineField = tableState.preCombineField
   private val recordKeyFieldOpt = tableState.recordKeyFieldOpt
   private val payloadProps = if (preCombineField.isDefined) {
-    
Some(HoodiePayloadConfig.newBuilder.withPayloadOrderingField(preCombineField.get).build.getProps)
+    val properties = HoodiePayloadConfig.newBuilder
+      .withPayloadOrderingField(preCombineField.get)
+      .withPayloadEventTimeField(preCombineField.get)

Review comment:
       I think not. But I also have no idea about the exception when set 
`returnNullIfNotFound` true and call `getNestedFieldVal`. But if 
`PAYLOAD_ORDERING_FIELD_PROP_KEY` is set automatically when `preCombineField` 
is set, which we should have done this, it works well.




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