jolshan commented on a change in pull request #9684:
URL: https://github.com/apache/kafka/pull/9684#discussion_r550905278



##########
File path: 
clients/src/main/java/org/apache/kafka/common/requests/DeleteTopicsRequest.java
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@@ -39,8 +45,25 @@ public Builder(DeleteTopicsRequestData data) {
 
         @Override
         public DeleteTopicsRequest build(short version) {
+            if (version >= 6 && data.topicNames().size() != 0) {
+                data.setTopics(groupByTopic(data.topicNames()));
+            } else if (version >= 6) {
+                for (DeleteTopicState topic : data.topics()) {
+                    if (topic.name().equals("")) {

Review comment:
       Good point. I think I was assuming the default is the empty string, but 
someone could set the data field to null.




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