Avro ENUM字段 [英] Avro ENUM field

问题描述

我正在尝试在Avro模式中创建Union字段，并使用它发送相应的JSON消息，但是要使用其中一个字段-null.

I am trying to create Union field in Avro schema and send corresponding JSON message with it but to have one of the fields - null.

https://avro.apache.org/docs/1.8 .2/spec.html#Unions

最简单的UNION类型(avro模式)与相应的JSON数据的示例是什么? (尝试以不包含null/empty数据的示例和包含null/empty数据的示例为例).

What is example of simplest UNION type (avro schema) with corresponding JSON data? (trying to make example without null/empty data and one with null/empty data).

推荐答案

这里有一个例子.

空枚举

{"name": "Stephanie", "age": 30, "sex": "female", "myenum": null}

不是空的枚举

{"name": "Stephanie", "age": 30, "sex": "female", "myenum": "HEARTS"}

模式

{
    "type": "record",
    "name": "Test",
    "namespace": "com.acme",
    "fields": [{
            "name": "name",
            "type": "string"
        }, {
            "name": "age",
            "type": "int"
        }, {
            "name": "sex",
            "type": "string"
        }, {
            "name": "myenum",
            "type": ["null", {
                    "type": "enum",
                    "name": "Suit",
                    "symbols": ["SPADES", "HEARTS", "DIAMONDS", "CLUBS"]
                }
            ]
        }
    ]
}

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