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https://issues.apache.org/jira/browse/AVRO-3631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17866716#comment-17866716
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ASF subversion and git services commented on AVRO-3631:
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Commit b8784012b8225935c4ee4b234d8afeaa78451f2f in avro's branch
refs/heads/avro-3631/fix-fixed-serialization from Martin Tzvetanov Grigorov
[ https://gitbox.apache.org/repos/asf?p=avro.git;h=b8784012b ]
AVRO-3631: Add serde serialize_with functions
Those should be used for hinting the serialization process how to serialize a
byte array to Value::(Bytes|Fixed)
Signed-off-by: Martin Tzvetanov Grigorov <mgrigo...@apache.org>
> 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: 4h
> 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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