[jira] [Resolved] (ARROW-8629) [Rust] Eliminate indirection of ZST allocations

["Andy Grove (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Grove resolved ARROW-8629.
-------------------------------
    Fix Version/s: 1.0.0
       Resolution: Fixed

Issue resolved by pull request 7061
[https://github.com/apache/arrow/pull/7061]

> [Rust] Eliminate indirection of ZST allocations
> -----------------------------------------------
>
>                 Key: ARROW-8629
>                 URL: https://issues.apache.org/jira/browse/ARROW-8629
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust
>    Affects Versions: 0.17.0
>            Reporter: Mahmut Bulut
>            Assignee: Mahmut Bulut
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> Currently, no matter what any array construction without data creates 0 sized layouts and passes itself to Rust's allocator API, thus OS then comes back to the program and does the job.
> This issue is two-fold:
>  * First, this creates indirection and UB in a sense.
>  * Second, degrades the performance for the merging simd, merging arrays, constructing arrays etc. and intermediate arrays when doing ops. over them.
> The solution would be:
>  * Having UB solved without a performance downside.
>  * Improve the performance



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