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Posted to jira@arrow.apache.org by "Andrew Lamb (Jira)" <ji...@apache.org> on 2021/04/26 12:38:03 UTC
[jira] [Closed] (ARROW-10274) [Rust] arithmetic without SIMD does
unnecesary copy
[ https://issues.apache.org/jira/browse/ARROW-10274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Lamb closed ARROW-10274.
-------------------------------
Resolution: Invalid
> [Rust] arithmetic without SIMD does unnecesary copy
> ---------------------------------------------------
>
> Key: ARROW-10274
> URL: https://issues.apache.org/jira/browse/ARROW-10274
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust
> Reporter: Ritchie
> Priority: Minor
>
> The arithmetic kernels that don't use SIMD create a `vec` in memory and later copy that data into a Buffer. Maybe we could directly write the arithmetic result to a mutable buffer and prevent this redundant copy?
>
>
> {code:java}
> let values = (0..left.len())
> .map(|i| op(left.value(i), right.value(i)))
> .collect::<Vec<T::Native>>();
>
>
> let data = ArrayData::new(
> T::get_data_type(),
> left.len(),
> None,
> null_bit_buffer,
> 0,
> vec![Buffer::from(values.to_byte_slice())],
> vec![],
> );{code}
>
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