TajoDataTypes.DataType.Builder builder = TajoDataTypes.DataType.newBuilder();
builder.setType(TajoDataTypes.Type.PROTOBUF);
builder.setCode(TajoIdProtos.QueryIdProto.class.getName());
ProtobufDatumFactory factory = ProtobufDatumFactory.get(builder.build());
TajoIdProtos.QueryIdProto.Builder queryIdBuilder = factory.newBuilder();
queryIdBuilder.setId(String.valueOf(System.currentTimeMillis()));
queryIdBuilder.setSeq(1);
TajoIdProtos.QueryIdProto queryId = queryIdBuilder.build();
ProtobufDatum datum = factory.createDatum(queryId);