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https://issues.apache.org/jira/browse/AVRO-3484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17523536#comment-17523536
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Martin Tzvetanov Grigorov commented on AVRO-3484:
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It seems we will need to use string as attribute value (syn/darling does not
support anything else).
{code:java}
#[derive(Debug, Serialize, Deserialize, AvroSchema, Clone, PartialEq)]
struct TestBasicWithDefaults {
#[avro(default = "0")]
int: u32,
#[avro(default = "true")]
condition: bool,
#[avro(default = "\"abc\"")]
str: String,
#[avro(default = "{\"a\": 1, \"b\": 2}")]
map: Map<String, i32>,
#[avro(default = "[1, 2, 3]")]
array: Vec<i32>,
#[avro(default = "FOO")]
myenum: MyEnum,
} {code}
And then set the value as-is in the generated schema.
Spec: https://avro.apache.org/docs/current/spec.html#schema_record
> Rust: Implement derive default via annotation
> ---------------------------------------------
>
> Key: AVRO-3484
> URL: https://issues.apache.org/jira/browse/AVRO-3484
> Project: Apache Avro
> Issue Type: Improvement
> Reporter: Jack Klamer
> Assignee: Jack Klamer
> Priority: Major
>
> Origin Comment: https://github.com/apache/avro/pull/1631#discussion_r845826110
> Follow up on the avro derive work. Will want to be able to set the default
> for a field inside a struct using annotations
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