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https://issues.apache.org/jira/browse/AVRO-3286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17628769#comment-17628769
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Miroslav commented on AVRO-3286:
--------------------------------
Hi, I've been having the same problem and I found out that in order for the
data to be valid, you need to put the value in another object where the key is
the type:
{"username":"user1","data":\{"string":"test"},"timestamp": 1366150681 }
[This is described
here.|https://avro.apache.org/docs/1.10.2/spec.html#:~:text=the%20string%20%22a%22%20as%20%7B%22string%22%3A%20%22a%22%7D%3B%20and]
For me it doesn't feel easy it use, because of how json parsing typically works
and I think it would be much better if it's changed to check every single data
type in an union instead of this.
> Serialization of optional fields with C++ library doesn't work
> --------------------------------------------------------------
>
> Key: AVRO-3286
> URL: https://issues.apache.org/jira/browse/AVRO-3286
> Project: Apache Avro
> Issue Type: Bug
> Components: c++
> Affects Versions: 1.10.2
> Reporter: Anton Kondratev
> Priority: Critical
>
> There is a problem with serialization of data having optional fields. When I
> pass null in corresponding field it works but when I pass non-null value then
> serialization fails.
> Example schema:
> {code:java}
> {
> "type": "record",
> "name": "schema",
> "namespace": "space",
> "fields": [
> {
> "name": "username",
> "type": "string"
> },
> {
> "name": "data",
> "type": [
> "null",
> "string"
> ],
> "defaults": null
> },
> {
> "name": "timestamp",
> "type": "long"
> }
> ]
> }{code}
> Data that works:
> {"username":"user1","data":null,"timestamp": 1366150681 }
> Data that fails:
> {"username":"user1","data":"test","timestamp": 1366150681 }
> My code:
> {code:java}
> std::unique_ptr<avro::InputStream> in = avro::memoryInputStream((const
> uint8_t*)&json[0], json.size()); // json is incoming data
> avro::ValidSchema validSchema;
> std::istringstream ins(schema); // schema is avro-schema
> try {
> avro::compileJsonSchema(ins, validSchema);
> }
> catch (const std::exception& e1) {
> std::string errstr = e1.what();
> }
> avro::DecoderPtr jd = avro::jsonDecoder(validSchema);
> avro::GenericDatum datum(validSchema);
> jd->init(*in);
> avro::decode(*jd, datum); //serialization with non-null data fails somewhere
> inside this step{code}
>
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