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https://issues.apache.org/jira/browse/AVRO-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022951#comment-16022951
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MihkelJ commented on AVRO-1582:
-------------------------------

We ran up against this issue recently, so I've created a standalone encoder 
from Zoltan Farkas' excellent ExtendedJsonDecoder, until this issue is 
resolved: https://github.com/Celos/avro-json-decoder

It handles point b) from above, infers the value of missing fields from their 
defaults. The only advantage is that it doesn't require forked avro.

> 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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