[jira] [Commented] (AVRO-3695) [Rust] Can't validate schema with value when Nullable union has multiple types.

["Martin Tzvetanov Grigorov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-3695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653979#comment-17653979 ] 

Martin Tzvetanov Grigorov commented on AVRO-3695:
-------------------------------------------------

Yes, this issue and AVRO-3646 are related.

I don't consider myself as an authority but the serde(-json) crates are pain in the ass :-/ I will try to find a workaround for the enum related issues in AVRO-3646 but the behavior of its maintainer is highly demotivating!

> [Rust] Can't validate schema with value when Nullable union has multiple types.
> -------------------------------------------------------------------------------
>
>                 Key: AVRO-3695
>                 URL: https://issues.apache.org/jira/browse/AVRO-3695
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: rust
>            Reporter: Mark Farnan
>            Priority: Blocker
>              Labels: pull-request-available, rust
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> If a union has more than one 'type' (other than null),  to_avro_datum is unable to validate the schema with the value type,  and throws a validation error. 
>  
> Schema: 
>  
> {code:java}
> { "type": "record", "namespace": "datatypes", "name": "nullunion", "fields": [ {"name": "item", "type": [ "null", "long", "double" ] } ] } {code}
>  
> Struct:  (This was generated by rsgen-avro)
> {code:java}
> /// Auto-generated type for unnamed Avro union variants.
> #[derive(Debug, PartialEq, Clone, serde::Deserialize, serde::Serialize)]
> pub enum UnionLongDouble {    Long(i64),    Double(f64),}
> #[derive(Debug, PartialEq, Clone, serde::Deserialize, serde::Serialize)]
> pub struct NullUnion {    pub item: Option<UnionLongDouble>,}{code}
>  
> {code:java}
> #[test]
> fn test_multivalue_union_tovalue() {
>     let nuschema = r#"
>     {
>         "type": "record",
>         "namespace": "datatypes",
>         "name": "nullunion",
>         "fields":
>         [
>             {"name": "item",
>                 "type": [
>                     "null",
>                     "long",
>                     "double"
>                 ]
>             }
>         ]
>     }
>     "#;   
>     let nullunion = NullUnion {
>         item: Some(UnionLongDouble::Long(34)),
>     };    let schema = Schema::parse_str(nuschema).unwrap();    
>     let nu_value = to_value(nullunion).unwrap();
>     let nu_encoded = to_avro_datum(&schema, nu_value).unwrap();
> } {code}



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