Issue with alias

[anatoly-kryzhanovsky]

precondition: -.net 6 application

• chr.avro, chr.avro.json, chr.avro.confluent of 10.3.0 versions

i have schema registry with schema with has record with alias

{
  "type": "record",
  "name": "my_entity",
  "namespace": "namespace",  
  "fields": [
    {
      "name": "payload",
      "type": [
        "null",
        {
          "type": "record",
          "name": "my_entity_payload_record",
          "fields": [...],
          "aliases": [
            "my_entity_payload"
          ]
        }
      ]
    }
  ]
}

when i try to serialize message i receive exception Value serialization error with message Sequence contains more than one matching element

then i try to investigate problem i found following:

• inside class JsonUnionSchemaReaderCase in method Read (L48) use Schemas.Single to get appopriate schemas from context
• at this moment i see following data in Context.Schemas:
  • namespace.my_entity_payload_record -> namespace.my_entity_payload_record
  • namespace.my_entity_payload -> namespace.my_entity_payload_record
• after that i receive children of type [null | my_entity_payload_record] and .Single fail (because there are two items with same value (but different keys)

is library support alias? may be there is some configuration that i should change?

[anatoly-kryzhanovsky]

ok. i investigate source code more and found that in JsonRecordSchemaReaderCase we add schema for each found aliases so if we use alias we have expect that there are multiple keys with same value in Schemas, but JsonUnionSchemaReaderCase use Single operation and faild. sound like bug

[dstelljes]

Thanks for the detailed reproduction! We'll release a fix with 10.3.1 shortly.

[anatoly-kryzhanovsky]

thank you for quick fix!