Is this a bug?

According to the documentation:

https://avro.apache.org/docs/current/api/cpp/html/classavro_1_1GenericDatum.html#a879e7b725023bfd8246e15f07cb5bef0

avro::GenericDatum::GenericDatum ( const ValidSchema<https://avro.apache.org/docs/current/api/cpp/html/classavro_1_1ValidSchema.html> & schema )

Constructs a datum corresponding to the given avro type.

The value will the appropraite default corresponding to the data type.

Parameters:
schema The schema that defines the avro type.

A GenericDatum when given a valid schema should have all its field fill with reasonable default. But it seems it is failing for union schema. I have a written the following piece of code which I input the script with a schema and then try to encode it and save the result in a file:

14 avro::ValidSchema load(const char* filename)

15 {

16 std::ifstream ifs(filename);

17 avro::ValidSchema result;

18 avro::compileJsonSchema(ifs, result);

19 return result;

20 }

21

22 int

23 main(int argc, char ** argv)

24 {

25 avro::ValidSchema sch = load(argv[1]); // load a schema

26

27 avro::GenericDatum metaDatum( sch );

28 std::auto_ptr<avro::OutputStream> out = avro::fileOutputStream( argv[2], 1 ); // write the result to a specified file

29 avro::EncoderPtr en = avro::jsonEncoder( sch );

30 en->init ( *out );

31 avro::encode ( *en, metaDatum );

32 en->flush();

33

34 return 0;

35 }

Case and point:

[pnip =>avro_rhel6<= my_avro]$ cat union.schema

[ "bytes", "long”]

[pnip =>avro_rhel6<= my_avro]$ ./schemaTest union.schema /tmp/result

terminate called after throwing an instance of 'avro::Exception'

what(): Not that many names

Aborted

It seems to work on other schema types (have not check all yet) but failed on union type schema