Mahmut Bulut created ARROW-8629:
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Summary: [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
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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