danny0405 commented on code in PR #9459:
URL: https://github.com/apache/hudi/pull/9459#discussion_r1296576118


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hudi-utilities/src/main/java/org/apache/hudi/utilities/sources/helpers/AvroConvertor.java:
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@@ -180,7 +180,7 @@ public GenericRecord withKafkaFieldsAppended(ConsumerRecord 
consumerRecord) {
     recordBuilder.set(KAFKA_SOURCE_OFFSET_COLUMN, consumerRecord.offset());
     recordBuilder.set(KAFKA_SOURCE_PARTITION_COLUMN, 
consumerRecord.partition());
     recordBuilder.set(KAFKA_SOURCE_TIMESTAMP_COLUMN, 
consumerRecord.timestamp());
-    recordBuilder.set(KAFKA_SOURCE_KEY_COLUMN, 
consumerRecord.key().toString());
+    recordBuilder.set(KAFKA_SOURCE_KEY_COLUMN, 
String.valueOf(consumerRecord.key()));

Review Comment:
   So the null key is represented as a `null` constant string.



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