[jira] [Commented] (ARROW-4150) [C++] Do not return buffers containing nullptr from internal allocations

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

    [ https://issues.apache.org/jira/browse/ARROW-4150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16734377#comment-16734377 ] 

Wes McKinney commented on ARROW-4150:
-------------------------------------

I renamed the issue to make it a bit more explicit what is going on

> [C++] Do not return buffers containing nullptr from internal allocations
> ------------------------------------------------------------------------
>
>                 Key: ARROW-4150
>                 URL: https://issues.apache.org/jira/browse/ARROW-4150
>             Project: Apache Arrow
>          Issue Type: Wish
>          Components: C++
>    Affects Versions: 0.11.1
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.12.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> When a 0-byte buffer is allocated, or at the start of a BufferBuilder, the buffer's data pointer can be null. This leads to passing null arguments (with zero sizes) to standard functions such as memset() and memcpy() in many places. UBSAN doesn't like it.
> Since a null pointer often means "failed allocating" or "programmer error", we might want to use a non-null pointer to a static empty piece of data instead.



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