Sean Busbey commented on AVRO-1582:

I've increased this from 'minor' to 'major' priority, but I believe the current 
blocker on it getting accepted is that we need a contributor that's willing to 
finish things up.

> Json serialization of nullable fileds and fields with default values 
> improvement.
> ---------------------------------------------------------------------------------
>                 Key: AVRO-1582
>                 URL: https://issues.apache.org/jira/browse/AVRO-1582
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.8.0
>            Reporter: Zoltan Farkas
>         Attachments: AVRO-1582-PATCH
> Currently serializing a nullable field of type union like:
> "type" : ["null","some type"]
> when serialized as JSON results in:  
> "field":{"some type":"value"}
> when it could be:
> "field":"value"
> Also fields that equal the the default value can be omitted from the 
> serialized data. This is possible because the reader will have the writer's 
> schema and can infer the field values. This reduces the size of the json 
> messages.

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