avro union的json编码 [英] json encoding of avro union

问题描述

我的avro架构中有一个UNITED，其UNITED_NUMBER可以是null或int.当我对对象进行json编码时，会得到:

I have a union in my avro schema for favorite_number which could be a null or an int. When I json encode the object I get:

{"name":"Alyssa"，"favorite_number":{"int":7}，"favorite_color":null}

{"name": "Alyssa", "favorite_number": {"int": 7}, "favorite_color": null}

我试图摆脱联合的类型指示符，在这种情况下为int，从而使其变为:

I am trying to get rid of the type indicator for the union, in this case the int, so that it becomes:

{名称":"Alyssa"，收藏夹编号":7，收藏夹颜色":蓝色"}

{"name": "Alyssa", "favorite_number": 7, "favorite_color": "blue"}

avro模式:

{"name": "person", "type": "record",
           "fields": [
              {"name": "name", "type": "string"},
              {"name": "favorite_number", "type": ["null", "int"], "default": null},
              {"name": "favorite_color", "type": "string"}
           ]
   }

有没有办法做到这一点?谢谢！

Is there a way to do this? Thanks!

推荐答案

编辑整个答案:)

似乎无法直接使用Avro API进行操作.有一段时间的拉取请求正在等待以支持可空类型

It looks like it is not possible do it directly with the Avro API. There is a pull request pending for a while to support this for nullable types

https://issues.apache.org/jira/browse/AVRO-1582

根据您的评论，我发现了尝试在没有数据类型的情况下进行序列化的相同问题，我最终使用了

Base on your comments, I found the same issue trying to serialize without data types, I ended up using toString function defined in https://avro.apache.org/docs/1.8.1/api/java/org/apache/avro/generic/GenericData.html#toString(java.lang.Object), The only cases where it does not work properly, is for schemas with circular references.

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