I only skimmed this, but the schema should read "default", not "defaults". I've no idea if that's the only issue.
J On Wed, Dec 22, 2021 at 8:40 AM Anton <anton...@yandex.ru> wrote: > Hi Martin, > > > > SchemaTests.cc checks only test compilation and my schema compiles fine > according to my code. > > Is there any test that checks full cycle of serialization/deserialization > process with json/schema provided? > > > > > > *From:* Martin Grigorov [mailto:mgrigo...@apache.org] > *Sent:* Wednesday, December 22, 2021 3:24 PM > *To:* user@avro.apache.org > *Subject:* Re: Serialization with optional fields using C++ library > > > > Hi Anton, > > > > I don't see any unit tests / examples for this at > https://github.com/apache/avro/tree/master/lang/c%2B%2B/ test|examples, > so I guess it is not implemented yet. > > You could add an entry for basicSchemas ( > https://github.com/apache/avro/blob/1aa963c44d1b9da3dfcf74acb3eeed56439332a0/lang/c%2B%2B/test/SchemaTests.cc#L30) > and if it fails then create an issue / PR. > > > > On Wed, Dec 22, 2021 at 10:13 AM Anton <anton...@yandex.ru> wrote: > > Hello, I have problem with serialization of data having optional fields. > When I pass null in corresponding field it works but when it is non-null > then serialization fails. > > Schema: > > { > > "type": "record", > > "name": "schema", > > "namespace": "space", > > "fields": [ > > { > > "name": "username", > > "type": "string" > > }, > > { > > "name": "data", > > "type": [ > > "null", > > "string" > > ], > > "defaults": null > > }, > > { > > "name": "timestamp", > > "type": "long" > > } > > ] > > } > > > > Data that works: > > {"username":"miguno","data":null,"timestamp": 1366150681 } > > > > Data that fails: > > {"username":"miguno","data":"test","timestamp": 1366150681 } > > > > Should it work or I have some error in my schema? I didn’t find any active > issues in jira so I guess the concept of optional fields should work just > fine, also in C++. > > > > The code is: > > > > 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 > >
