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From "Ramana Suvarapu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1474) C++ resolvind decoder doesn't work when reader schema has more fields than writer schema
Date Fri, 25 Apr 2014 19:17:20 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ramana Suvarapu updated AVRO-1474:
----------------------------------

    Attachment: AVRO-1474-ResolvingDecoder.patch

> 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.
>         Attachments: AVRO-1474-ResolvingDecoder.patch, AVRO-1474.patch, bigrecord, bigrecord_r,
reader, writer
>
>
> 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. 
> The same issue is reported in AVRO-1360.



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