Daniel Heinrich created AVRO-3649:
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             Summary: [JAVA] reorder union types to match default value
                 Key: AVRO-3649
                 URL: https://issues.apache.org/jira/browse/AVRO-3649
             Project: Apache Avro
          Issue Type: Improvement
            Reporter: Daniel Heinrich


The Avro specification requires that a default value matches the first schema 
of a union type.

 

Using @Nullable on a field will return a union type of the form ["null", 
"<something>"].

@Nullable also sets the default value to "null".

 

It is not possible to override this default value with 
{color:#bbb529}{color:#172b4d}@AvroDefault because of the order of the schemas 
in the generated union.{color}
{color}

 

It would be nice that union types are automatically reordered to match the type 
of the provided default value.



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