[jira] [Created] (AVRO-4332) IDL writer does not serialize enum default values

[Maxim Prygunov (Jira)]

Maxim Prygunov created AVRO-4332:
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             Summary: 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


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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