AHeise commented on a change in pull request #16142:
URL: https://github.com/apache/flink/pull/16142#discussion_r660018383
##########
File path:
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java
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@@ -860,7 +861,7 @@ public void invoke(
String targetTopic = keyedSchema.getTargetTopic(next);
if (targetTopic == null) {
targetTopic = defaultTopicId;
- } else if (defaultTopicId == null) {
+ } else if (TOPIC_UNSPECIFIED.equals(defaultTopicId)) {
Review comment:
Revert.
##########
File path:
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java
##########
@@ -900,7 +901,7 @@ public void invoke(
String targetTopic = contextAwareSchema.getTargetTopic(next);
if (targetTopic == null) {
targetTopic = defaultTopicId;
- } else if (defaultTopicId == null) {
+ } else if (TOPIC_UNSPECIFIED.equals(defaultTopicId)) {
Review comment:
Revert.
##########
File path:
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/table/DynamicKafkaSerializationSchema.java
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@@ -166,7 +168,7 @@ public void setPartitions(int[] partitions) {
@Override
public String getTargetTopic(RowData element) {
- return topic == null
+ return TOPIC_UNSPECIFIED.equals(topic)
? readMetadata(element,
KafkaDynamicSink.WritableMetadata.TOPIC)
Review comment:
I just saw that `readMetadata` can return `null` which it shouldn't (and
it's not annotated!).
What is the expected target topic then? I guess `TOPIC[0]`?
But what happens if the user didn't set `TOPIC`? Can you check the schema if
the column is nullable and fail if `TOPIC` is empty/unset?
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