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https://issues.apache.org/jira/browse/AVRO-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15276486#comment-15276486
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Ryan Blue commented on AVRO-1582:
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The now-abandoned Kite project has quite a bit of useful code for this. For
example, it has a
[{{resolveUnion}}|https://github.com/kite-sdk/kite/blob/master/kite-data/kite-data-core/src/main/java/org/kitesdk/data/spi/JsonUtil.java#L365]
method that I think implements what most people expect. Hopefully that makes
this issue a bit easier.
> 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
> Priority: Minor
> 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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