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https://issues.apache.org/jira/browse/AVRO-1360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751124#comment-13751124
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Thiruvalluvan M. G. commented on AVRO-1360:
-------------------------------------------
I'll commit this soon unless there are objections or suggestions for
improvement.
> 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
> Assignee: Thiruvalluvan M. G.
> Attachments: AVRO-1360.patch, 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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