[jira] [Commented] (AVRO-2736) Avro-cpp schema resolution fails on complex union type

["Gerrit Birkeland (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-2736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17869499#comment-17869499 ] 

Gerrit Birkeland commented on AVRO-2736:
----------------------------------------

For ease of reproduction, I stripped down the schema to a smaller sample set and created https://github.com/Gerrit0/repros/tree/AVRO-2736 -- this is specifically a problem with the JSON decoder. The binary decoder works as expected.

> Avro-cpp schema resolution fails on complex union type
> ------------------------------------------------------
>
>                 Key: AVRO-2736
>                 URL: https://issues.apache.org/jira/browse/AVRO-2736
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: c++
>    Affects Versions: 1.9.1
>         Environment: ubuntu 18.04
>            Reporter: Michiel Mertens
>            Priority: Major
>         Attachments: ControllerLog.avro.json
>
>
> When using the attached JSON schema, we can encode/decode without problems.
> When i promote BurstInfo:demodId from int to long, decoding fails on old files.
> I get the following exception
> {noformat}
> Invalid operation. Schema requires: Union, got: Record 
> {noformat}
> It seems that the resolving decoder is resolving correctly, but the exception is throw during parsing at accessing the root of the tree.
> I dont think the actual content of the file matters, but I did not tests that.



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