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https://issues.apache.org/jira/browse/AVRO-4332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18104408#comment-18104408
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Maxim Prygunov commented on AVRO-4332:
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https://github.com/apache/avro/pull/3822
> IDL writer does not serialize enum default values
> -------------------------------------------------
>
> Key: AVRO-4332
> URL: https://issues.apache.org/jira/browse/AVRO-4332
> Project: Apache Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.12.1, 1.13.0, 1.12.2
> Reporter: Maxim Prygunov
> Priority: Major
>
> When an Avro Schema of type ENUM has a default value set (via
> Schema.createEnum(name, doc, namespace, symbols, enumDefault)), the IDL
> writer in IdlUtils.writeSchema() does not serialize the default value into
> the IDL output.
> For example, given an enum schema with "default": "ACTIVE":
> 1 Schema enumWithDefault = Schema.createEnum("Status", null, "naming",
> 2 Arrays.asList("ACTIVE", "INACTIVE"), "ACTIVE");
> Calling IdlUtils.writeIdlProtocol(writer, enumWithDefault) produces:
> 1 enum Status \{ ACTIVE, INACTIVE }
> But the correct IDL representation should be:
> 1 enum Status \{ ACTIVE, INACTIVE } = ACTIVE;
> This means round-tripping (IDL → Schema → IDL) loses the default value
> information for enums, which can cause downstream issues in code generators
> and schema validation.
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