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Posted to jira@arrow.apache.org by "Tyrel Rink (Jira)" <ji...@apache.org> on 2021/02/07 19:50:00 UTC

[jira] [Created] (ARROW-11546) [Rust][Experiment][WIP] Experiment with a TypedArray trait

Tyrel Rink created ARROW-11546:
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             Summary: [Rust][Experiment][WIP] Experiment with a TypedArray trait
                 Key: ARROW-11546
                 URL: https://issues.apache.org/jira/browse/ARROW-11546
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust
            Reporter: Tyrel Rink
            Assignee: Tyrel Rink


A few of the arrow kernels rely on macros to iterate over values using a common ".value()" function, but:
* this is unsafe on some array types (string, binary), but unsafe on other array types (primitive)
* this forces iteration by index, which does not always optimize away bounds-checking (at least in the binary case)

This PR is an experiment with a TypedArray trait, which provides access to array values (along with associated types describing those values).  This will NOT remove the need for downcasting, as the associated types aren't object-safe.  But it should be sufficient to allow simple processing of values from multiple array types using a generic function instead of a macro.



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