AndrewJSchofield commented on code in PR #18894:
URL: https://github.com/apache/kafka/pull/18894#discussion_r1955794920


##########
tools/src/main/java/org/apache/kafka/tools/consumer/group/ShareGroupCommand.java:
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@@ -250,7 +252,7 @@ TreeMap<String, Entry<ShareGroupDescription, 
Collection<SharePartitionOffsetInfo
                             groupId,
                             tp.getKey().topic(),
                             tp.getKey().partition(),
-                            earliestResult.get(tp.getKey())
+                            
Optional.ofNullable(earliestResult.get(tp.getKey()))

Review Comment:
   I have analysed how `Admin.listConsumerGroupOffsets` behaves and copied 
that. I want someone with code that works with consumer groups to be able to 
move across to share groups with minimal friction. Conceptually, I agree with 
you, but I went with consistency. It's modelled on 
`ListConsumerGroupOffsetsResult`.
   
   I think there are two cases here. First, there might have been an error 
(most likely `TOPIC_AUTHORIZATION_FAILED`) for a particular requested 
topic-partition. Second, there might not have been an error, but there is no 
offset information. Both of these are `null`. Both "you cannot know the offset" 
and "there is no offset".



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