Ramana Suvarapu created AVRO-1360:
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Summary: C++ Resolving decoder is not working when reader schema
has more fields than writer schema
Key: AVRO-1360
URL: https://issues.apache.org/jira/browse/AVRO-1360
Project: Avro
Issue Type: Bug
Components: c++
Affects Versions: 1.7.4
Reporter: Ramana Suvarapu
Attachments: reader.json, writer.json
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.
Can you please let us know if there are any other limitations with c++
implementation of ResolvingDecoder? We are planning to use it in our project
and we want to make sure it works as per avro specification.
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