[jira] [Created] (AVRO-3992) [C++] Encoding a record with 0 fields in a vector throws

[Gerrit Birkeland (Jira)]

Gerrit Birkeland created AVRO-3992:
--------------------------------------

             Summary: [C++] Encoding a record with 0 fields in a vector throws
                 Key: AVRO-3992
                 URL: https://issues.apache.org/jira/browse/AVRO-3992
             Project: Apache Avro
          Issue Type: Improvement
          Components: c++
    Affects Versions: 1.11.3
            Reporter: Gerrit Birkeland


I have an Avro schema resembling the following:

{code}
{
  "type": "record",
  "name": "StackCalculator",
  "fields": [
    {
      "name": "stack",
      "type": {
        "type": "array",
        "items": [
          "int",
          {
            "type": "record",
            "name": "Dup",
            "fields": []
          },
          {
            "type": "record",
            "name": "Add",
            "fields": []
          }
        ]
      }
    }
  ]
}
{code}

If I create one of these records with the stack:
{code}
uer::StackCalculator calc;
uer::StackCalculator::stack_item_t item;
item.set_int(3);
calc.stack.push_back(item);
item.set_Dup(uer::Dup());
calc.stack.push_back(item);
item.set_Add(uer::Add());
calc.stack.push_back(item);
{code}

and try to encode this

{code}
ValidSchema s;
ifstream ifs("jsonschemas/union_empty_record");
compileJsonSchema(ifs, s);

unique_ptr<OutputStream> os = memoryOutputStream();
EncoderPtr e = validatingEncoder(s, jsonPrettyEncoder());
e->init(*os);
avro::encode(*e, calc);
{code}

Avro throws {{startItem at not an item boundary}}. If the records without 
fields are given a dummy field, this works.



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