[jira] [Created] (AVRO-3286) Serialization of optional fields with C++ library doesn't work

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

Anton Kondratev created AVRO-3286:
-------------------------------------

             Summary: 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


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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