[jira] [Commented] (AVRO-3188) Avro C++ library doesn't accept JSON without a field for union-type fields with default = null

["Anton Kondratev (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-3188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463457#comment-17463457 ] 

Anton Kondratev commented on AVRO-3188:
---------------------------------------

Hi [~pradn], in my case even serialization doesn't work when I have optional field in schema (\{"name": "somefield", type": ["null", "string"], "defaults": null}) and nonempty corresponding field in json-data ("somefield":"somedata"). I'm using 1.10.2 version too. Do you have such problem? 

> Avro C++ library doesn't accept JSON without a field for union-type fields with default = null
> ----------------------------------------------------------------------------------------------
>
>                 Key: AVRO-3188
>                 URL: https://issues.apache.org/jira/browse/AVRO-3188
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: c++
>    Affects Versions: 1.10.2
>         Environment: Debian
>            Reporter: Prad Nelluru
>            Priority: Minor
>
> We have a schema with a record with a union-type field with the "null" type being the first type and with a default value of `null`. When given a JSON datum without that field, decoding fails. I'd expect decoding to succeed with that field being given a value of `null`. Repro unit test to place in CodecTests.cc. (Apologies I can't get the code-formatting directives to work, so the code is a bit jumbled.)
> {{static void optionalFieldNotSupported() {
>     const char *text = "{\"f1\": true }";
>     InputStreamPtr in =
>         memoryInputStream(reinterpret_cast<const uint8_t *>(text),
>                           ::strlen(text));
>     const char *schemaStr = "{\"type\":\"record\",\"name\":\"r\",\"fields\":["
>                             "{\"name\":\"f1\", \"type\":\"boolean\"},"
>                             "{\"name\":\"f2\", \"type\":[\"null\", \"long\"], \"default\": null}"
>                             "]}";
>     ValidSchema schema = parsing::makeValidSchema(schemaStr);
>     DecoderPtr d = jsonDecoder(schema);
>     {
>         d->init(*in);
>         avro::GenericDatum datum(schema);
>         avro::decode(*d, datum);
>     }
> }}}



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