[jira] [Updated] (ARROW-2843) [Format/C++/Java] Removing field layout from Schema.fbs breaks backward compatibility

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-2843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-2843:
----------------------------------
    Labels: pull-request-available  (was: )

> [Format/C++/Java] Removing field layout from Schema.fbs breaks backward compatibility
> -------------------------------------------------------------------------------------
>
>                 Key: ARROW-2843
>                 URL: https://issues.apache.org/jira/browse/ARROW-2843
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Format
>    Affects Versions: 0.8.0, 0.9.0
>            Reporter: Yuliya Feldman
>            Assignee: Yuliya Feldman
>            Priority: Major
>              Labels: pull-request-available
>
> Change in [ARROW-1785|https://issues.apache.org/jira/browse/ARROW-1785]
> Breaks backward compatibility with schema generated in prior versions of Arrow, as VectorLayout field was removed from Field table.
> This is definitely not supported behavior in FlatBuffers.
> I suggest to put back following field
> {code:java}
> layout: [ VectorLayout ] (deprecated);
> {code}
>  into 
> {code:java}
> table Field 
> {code}
> and mark it "deprecated" - as shown above
> It will also require putting back 
> {code:java}
> table VectorLayout
> {code}
> which can have all the deprecated fields as well.
> code generation footprint will be minimal in this case, as FlatBuffers won't generate getters for deprecated fields, but it will really solve backward compatibility issues.
> Also may be a good idea to introduce "version" into Schema.
>  
>  
>  



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