[jira] [Created] (ARROW-10989) [Rust] Use slices for iterating primitive arrays

["Tyrel Rink (Jira)" <ji...@apache.org>]

Tyrel Rink created ARROW-10989:
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             Summary: [Rust] Use slices for iterating primitive arrays
                 Key: ARROW-10989
                 URL: https://issues.apache.org/jira/browse/ARROW-10989
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust
            Reporter: Tyrel Rink


Iterating slices instead of indexes seems to improve performance of non-simd arithmetic operations.

This adds a new method raw_values_slice to PrimitiveArray (so named to pun off of the raw_values function which returns a pointer). A few of the functions in PrimitiveArray rely on the caller for safety guarantees (bounds-checks for value_slice, value), so should probably be unsafe? But they are used widely, so I thought it simpler to start by adding a safer alternative...



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