AHeise commented on a change in pull request #16142:
URL: https://github.com/apache/flink/pull/16142#discussion_r659735774



##########
File path: 
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/table/KafkaDynamicTableFactory.java
##########
@@ -224,7 +224,7 @@ public DynamicTableSink createDynamicTableSink(Context 
context) {
                 keyProjection,
                 valueProjection,
                 keyPrefix,
-                tableOptions.get(TOPIC).get(0),
+                tableOptions.getOptional(TOPIC).isPresent() ? 
tableOptions.get(TOPIC).get(0) : null,

Review comment:
       Here at this place, you could use `unspecified!` instead of null. Then 
you don't need to change anything in the `KafkaProducer`. If you use a special 
character like `!`, this will fail hard if the user row does not specify the 
column.




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