[jira] [Resolved] (ARROW-3740) [C++] Calling ArrayBuilder::Resize with length smaller than current appended length results in invalid state

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

     [ https://issues.apache.org/jira/browse/ARROW-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-3740.
---------------------------------
    Resolution: Fixed

Issue resolved by pull request 3055
[https://github.com/apache/arrow/pull/3055]

> [C++] Calling ArrayBuilder::Resize with length smaller than current appended length results in invalid state
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-3740
>                 URL: https://issues.apache.org/jira/browse/ARROW-3740
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.11.1
>            Reporter: Wes McKinney
>            Assignee: Francois Saint-Jacques
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.12.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> This was brought up by the Go patch ARROW-3613. If you append some data to a builder, then call {{Resize}} with something smaller than what's reported by {{length()}}, the capacity will be updated, but the length will not. So I think further appends would probably segfault. Either way we should add some tests for this case of "shrinking" a builder (which destroys data, but it's permitted by the API 



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