[jira] [Resolved] (ARROW-6869) [C++] Dictionary "delta" building logic in builder_dict.h produces invalid arrays

["Wes McKinney (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-6869.
---------------------------------
    Fix Version/s: 0.15.1
       Resolution: Fixed

Issue resolved by pull request 5687
[https://github.com/apache/arrow/pull/5687]

> [C++] Dictionary "delta" building logic in builder_dict.h produces invalid arrays
> ---------------------------------------------------------------------------------
>
>                 Key: ARROW-6869
>                 URL: https://issues.apache.org/jira/browse/ARROW-6869
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Wes McKinney
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 1.0.0, 0.15.1
>
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> Looking at the unit tests for the dictionary delta logic -- the arrays that are produced by subsequent invocations of {{Finish}} yield DictionaryArray instances with partial dictionaries. I think this is misleading (I was surprised to find this while working on ARROW-6861). We should develop a different approach to computing dictionary delta. 



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