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Date: Mon, 9 Sep 2013 21:22:53 +0000 (UTC)
From: "Thiruvalluvan M. G. (JIRA)" <jira@apache.org>
To: dev@avro.apache.org
Message-ID: <JIRA.12663217.1376316415128.103443.1378761773083@arcas>
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Subject: [jira] [Updated] (AVRO-1360) C++ Resolving decoder is not working
 when reader schema has more fields than writer schema
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     [ https://issues.apache.org/jira/browse/AVRO-1360?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thiruvalluvan M. G. updated AVRO-1360:
--------------------------------------

    Attachment: AVRO-1360-3.patch
   =20
> C++ Resolving decoder is not working when reader schema has more fields t=
han 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-1360-2.patch, AVRO-1360-3.patch, AVRO-1360.patc=
h, testreader, testreader-1, testreader.hh, testwriter, testwriter-1, testw=
riter.hh
>
>
> When reader schema has more number of fields than writer schema, C++ impl=
ementation of resolving decoder is throwing exception "throwing exception "=
Don't know how to handle excess fields for reader.=E2=80=9D with out checki=
ng whether fields are optional or fields have default values.
> Attached are reader and writer schemas. Record in reader schema has 2 add=
itional fields than writer schema. One field is required field but it has d=
efault 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.=20
> =20
> {"name": "defaultField", "type": "string", "default": "DEFAULT", "declare=
d":"true"},    =20
> {"name": "optionalField", "type": ["string", "null"],"declared":"true"},
> =20
> main()
> {
>   avro::ValidSchema readerSchema =3D load("reader.json");
>   avro::ValidSchema writerSchema =3D load("writer.json");
>   avro::DecoderPtr d =3D avro::resolvingDecoder(writerSchema, readerSchem=
a,avro::binaryDecoder());
> }
> =20
> But when I tried to create resolving decoder, I am getting "Don't know ho=
w to handle excess fields for reader.=E2=80=9D But Java implementation work=
s. =20
> =20
> Can you please let us know if there are any other limitations with c++ im=
plementation 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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