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From "Ramana Suvarapu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-1360) C++ Resolving decoder is not working when reader schema has more fields than writer schema
Date Fri, 30 Aug 2013 18:57:53 GMT

    [ https://issues.apache.org/jira/browse/AVRO-1360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755017#comment-13755017
] 

Ramana Suvarapu commented on AVRO-1360:
---------------------------------------

Yes.
                
> 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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