[jira] [Commented] (AVRO-2137) avro JsonDecoding additional field in array type

["donald cestnik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-2137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780874#comment-16780874 ] 

donald cestnik commented on AVRO-2137:
--------------------------------------

I have also encountered this issue as well and is a show stopper for us using avro until resolved. 

> avro JsonDecoding additional field in array type
> ------------------------------------------------
>
>                 Key: AVRO-2137
>                 URL: https://issues.apache.org/jira/browse/AVRO-2137
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.1
>            Reporter: Arun sethia
>            Priority: Major
>
> I have following avro schema:
> {code:json}
> {
>   "type": "record",
>   "name": "test",
>   "namespace": "test.name",
>   "fields": [
>     {
>       "name": "items",
>       "type": {
>         "type": "array",
>         "items": {
>           "type": "record",
>           "name": "items",
>           "fields": [
>             {
>               "name": "name",
>               "type": "string"
>             },
>             {
>               "name": "state",
>               "type": "string"
>             }
>           ]
>         }
>       }
>     },
>     {
>       "name": "firstname",
>       "type": "string"
>     }
>   ]
> }
> {code}
> when I am using Json decoder and avro encoder to encode Json data (scala code):
>  {code:scala}
> val writer = new GenericDatumWriter[GenericRecord](schema)
> val reader = new GenericDatumReader[GenericRecord](schema)
> val baos = new ByteArrayOutputStream
> val decoder: JsonDecoder = DecoderFactory.get.jsonDecoder(schema, json)
> val encoder = EncoderFactory.get.binaryEncoder(baos, null)
> val datum = reader.read(null, decoder) writer.write(datum, encoder)
> encoder.flush()
> val avroByteArray = baos.toByteArray
>  {code}
> *scenario1:* when I am passing following json to encode it works fine:
> {code:json}
>  {
>   "items": [
>     {
>       "name": "dallas",
>       "state": "TX"
>     }
>   ],
>   "firstname": "arun"
> }
> {code}
>  *scenario2:* when I am passing additional attribute in json at root level (lastname) it is able to encode and works fine:
> {code:json}
> {
>   "items": [
>     {
>       "name": "dallas",
>       "state": "TX"
>     }
>   ],
>   "firstname": "fname",
>   "lastname": "lname"
> }
> {code}
> *scenario3*: when I am add additional attribute in array record (country) it is throwing following exception:
> {code:scala}
> Expected record-end. Got FIELD_NAME org.apache.avro.AvroTypeException: Expected record-end. Got FIELD_NAME at org.apache.avro.io.JsonDecoder.error(JsonDecoder.java:698) { "items": [
> { "name": "dallas", "state": "TX", "country":"USA" }
> ], "firstname":"fname", "lastname":"lname" }
> {code}
>  In case of if we have any additional element in array type, it should work in same way as normal record; it should just discard them and decode the Json data.



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