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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/04/26 12:47:16 UTC

[GitHub] [arrow-rs] alamb opened a new issue #179: [Rust][Experiment][WIP] Experiment with a TypedArray trait

alamb opened a new issue #179:
URL: https://github.com/apache/arrow-rs/issues/179


   *Note*: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-11546
   
   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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