Copilot commented on code in PR #19895:
URL: https://github.com/apache/kafka/pull/19895#discussion_r2128310086


##########
tools/src/main/java/org/apache/kafka/tools/streams/StreamsGroupCommand.java:
##########
@@ -77,6 +89,8 @@ public static void run(StreamsGroupCommandOptions opts) {
                 streamsGroupService.listGroups();
             } else if (opts.options.has(opts.describeOpt)) {
                 streamsGroupService.describeGroups();
+            } else if (opts.options.has(opts.describeOpt)) {

Review Comment:
   The delete-offsets branch is mistakenly checking opts.describeOpt instead of 
opts.deleteOffsetsOpt. Update the condition to use opts.deleteOffsetsOpt to 
properly distinguish the action.
   ```suggestion
               } else if (opts.options.has(opts.deleteOffsetsOpt)) {
   ```



##########
tools/src/main/java/org/apache/kafka/tools/streams/StreamsGroupCommand.java:
##########
@@ -326,10 +469,40 @@ Map<TopicPartition, OffsetsInfo> 
getOffsets(StreamsGroupDescription description)
             return output;
         }
 
+        private Stream<TopicPartition> parseTopicsWithPartitions(String 
topicArg) {
+            ToIntFunction<String> partitionNum = partition -> {
+                try {
+                    return Integer.parseInt(partition);
+                } catch (NumberFormatException e) {
+                    throw new IllegalArgumentException("Invalid partition '" + 
partition + "' specified in topic arg '" + topicArg + "''");

Review Comment:
   The error message in parseTopicsWithPartitions contains an extra single 
quote at the end. Consider correcting it to ensure the message is clear.
   ```suggestion
                       throw new IllegalArgumentException("Invalid partition '" 
+ partition + "' specified in topic arg '" + topicArg + "'");
   ```



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