org.apache.avro.UnresolvedUnionException: Not in union ["null",{"type":"enum","name":"document_change_type","namespace":"document","symbols":["create","update","delete"]}]: create
我正在为此字段传递字符串create
,并且它抛出了上述异常。
create
是枚举的3个可接受值之一,是什么导致异常?
答案 0 :(得分:6)
假设您的avro架构看起来像这样:
{
"type" : "record",
"namespace" : "document",
"name" : "document_details",
"fields" : [
{ "name" : "documentName" , "type" : "string" },
{"name" : "documentChange" ,
"type" : ["null",
{"type" : "enum",
"namespace" : "document",
"name" : "documentChangeType",
"symbols" :["create","update","delete"]
}]
}
]
}
您可以在代码中为此架构创建记录:
GenericRecord documentDetailsRecord = new GenericData.Record(schema);
GenericEnumSymbol enumSymbol = new GenericData.EnumSymbol(schema.getField("documentChange").schema().getTypes().get(1), "create");
e2.put("documentName", "someDocumentName");
e2.put("documentChange",enumSymbol);
您可以按如下方式获取所有联合字段的架构列表:
schema.getField(<unionFieldName>).schema().getTypes()