[AVRO-1674] Optional field does not work in avro-cpp

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.7.7
• Component/s: c++
• Assignee: Unassigned
• Reporter: Charlie Quillard
• Created: 29/May/15 15:23
• Updated: 28/Dec/18 16:29
• Resolved: 24/Aug/15 04:08

Description

I have to implement an optional field in my avro schema and when i test this one with avro-py that works and that does not works with avro-cpp.

That is my schema (cpx.json) :

{
  "type" : "record",
  "name" : "example",
  "fields" : [
    {
      "name": "city",
      "type": ["null", "string"],
      "defaults":null
    }
  ]
}

That is my cpp code:

typedef std::pair<avro::ValidSchema, avro::GenericDatum> Pair;

int main(int ac, char **av)
{

    std::ifstream ifs("cpx.json");
    avro::ValidSchema schema;
    avro::compileJsonSchema(ifs, schema);

    Pair p(schema, avro::GenericDatum());

    avro::GenericDatum &Data = p.second;
    Data = avro::GenericDatum(schema);
    avro::GenericRecord &sReord = Data.value<avro::GenericRecord>();
    sReord.setFieldAt(sReord.fieldIndex("city"), avro::GenericDatum("test"));
    avro::DataFileWriter<Pair> dataFileWriter("test.bin", schema);
    dataFileWriter.write(p);
    dataFileWriter.close();
}

This is my error when i transform my binary to json with avo-tools :

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at org.apache.avro.io.parsing.Symbol$Alternative.getSymbol(Symbol.java:402)
at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:290)
at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:267)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:155)
at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:193)
at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:183)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151)
at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
at org.apache.avro.file.DataFileStream.next(DataFileStream.java:233)
at org.apache.avro.file.DataFileStream.next(DataFileStream.java:220)
at org.apache.avro.tool.DataFileReadTool.run(DataFileReadTool.java:77)
at org.apache.avro.tool.Main.run(Main.java:84)
at org.apache.avro.tool.Main.main(Main.java:73)