[jira] [Updated] (ARROW-12530) [C++] Remove Buffer::mutable_data_ member and use const_cast on data_ only if is_mutable_ is true

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

     [ https://issues.apache.org/jira/browse/ARROW-12530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-12530:
-----------------------------------
    Labels: pull-request-available  (was: )

> [C++] Remove Buffer::mutable_data_ member and use const_cast on data_ only if is_mutable_ is true
> -------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-12530
>                 URL: https://issues.apache.org/jira/browse/ARROW-12530
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Proposed new implementation of mutable_data() by [~apitrou]
> {code}
>   uint8_t* mutable_data() {
>      return is_mutable() ? const_cast<uint8_t*>(data()) : nullptr;
>    }
> {code}
> This will help avoid various classes of bugs (initializing Buffer subclasses incorrectly) and make the object smaller on the heap



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