[jira] [Commented] (AVRO-3631) Fix serialization of structs containing Fixed fields

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

    [ https://issues.apache.org/jira/browse/AVRO-3631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653995#comment-17653995 ] 

Martin Tzvetanov Grigorov commented on AVRO-3631:
-------------------------------------------------

The best thing one can do is to vote for https://github.com/serde-rs/bytes/pull/28

> Fix serialization of structs containing Fixed fields
> ----------------------------------------------------
>
>                 Key: AVRO-3631
>                 URL: https://issues.apache.org/jira/browse/AVRO-3631
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: rust
>            Reporter: Rik Heijdens
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> Consider the following minimal Avro Schema:
> {noformat}
> {
>     "type": "record",
>     "name": "TestStructFixedField",
>     "fields": [
>         {
>             "name": "field",
>             "type": {
>                 "name": "field",
>                 "type": "fixed",
>                 "size": 6
>             }
>         }
>     ]
> }
> {noformat}
> In Rust, I might represent this schema with the following struct:
> {noformat}
> #[derive(Debug, Serialize, Deserialize)]
> struct TestStructFixedField {
>     field: [u8; 6]
> }
> {noformat}
> I would then expect to be able to use `apache_avro::to_avro_datum()` to convert an instance of `TestStructFixedField` into an `Vec<u8>` using an instance of `Schema` initialized from the schema listed above.
> However, this fails because the `Value` produced by `apache_avro::to_value()` represents `field` as an `Value::Array<Value::Int>` rather than a `Value::Fixed<6, Vec<u8>` which does not pass schema validation.
> I believe that there are two options to fix this:
> 1. Allow Value::Array<Vec<Value::Int>> to pass validation if the array has the expected length, and none of the contents of the array are out-of-range for u8. If we go down this route, the implementation of `to_avro_datum()` will have to take care of converting Value::Int to u8 when converting into bytes.
> 2. Update `apache_avro::to_value()` such that fixed length arrays are converted into `Value::Fixed<N, Vec<u8>>` rather than `Value::Array`.



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