Ramana Suvarapu created AVRO-1474:
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Summary: C++ resolvind decoder doesn't work when reader schema has
more fields than writer schema
Key: AVRO-1474
URL: https://issues.apache.org/jira/browse/AVRO-1474
Project: Avro
Issue Type: Bug
Components: c++
Affects Versions: 1.7.6
Reporter: Ramana Suvarapu
Assignee: Thiruvalluvan M. G.
When reader schema has more number of fields than writer schema, C++
implementation of resolving decoder is throwing exception "throwing exception
"Don't know how to handle excess fields for reader.” with out checking whether
fields are optional or fields have default values.
Attached are reader and writer schemas. Record in reader schema has 2
additional fields than writer schema. One field is required field but it has
default value and another one is optional field (union of null and string).
Since one has default value and another is optional both reader and writer
schemas are supposed to be compatible.
{"name": "defaultField", "type": "string", "default": "DEFAULT",
"declared":"true"},
{"name": "optionalField", "type": ["string", "null"],"declared":"true"},
main()
{
avro::ValidSchema readerSchema = load("reader.json");
avro::ValidSchema writerSchema = load("writer.json");
avro::DecoderPtr d = avro::resolvingDecoder(writerSchema,
readerSchema,avro::binaryDecoder());
}
But when I tried to create resolving decoder, I am getting "Don't know how to
handle excess fields for reader.” But Java implementation works.
Also field ordering is not working.
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