[ARROW-10989] [Rust] Use slices for iterating primitive arrays

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Rust
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/18428
• Assignee: Tyrel Rink
• Reporter: Tyrel Rink
• Created: 20/Dec/20 03:46
• Updated: 11/Jan/23 08:16
• Resolved: 24/Dec/20 03:22

Description

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...

Issue Links

• relates to: ARROW-11099 [Rust]: Remove unsafe value_slice method from PrimitiveArray and BooleanArray
• links to: GitHub Pull Request #8973