Chia-Ping Tsai created KAFKA-17882:
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             Summary: improve the document about "default value" of tagged 
structure field
                 Key: KAFKA-17882
                 URL: https://issues.apache.org/jira/browse/KAFKA-17882
             Project: Kafka
          Issue Type: Improvement
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai


In the [Apache Kafka 
documentation|https://github.com/apache/kafka/tree/trunk/clients/src/main/resources/common/message#deserializing-messages],
 we don't mention the default values for fields in tagged structures. What 
happens if not all fields of a tagged structure have explicit default values? 
Does the implicit default value still apply?

We should document this behavior as follows: 'A tagged structure field will be 
ignored if all of its fields' values are equal to their default values, 
regardless of whether those default values are defined explicitly or implicitly.



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