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Posted to jira@arrow.apache.org by "Maarten Breddels (Jira)" <ji...@apache.org> on 2020/06/15 08:58:00 UTC

[jira] [Created] (ARROW-9131) [C++] Faster ascii_lower and ascii_upper

Maarten Breddels created ARROW-9131:
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             Summary: [C++] Faster ascii_lower and ascii_upper
                 Key: ARROW-9131
                 URL: https://issues.apache.org/jira/browse/ARROW-9131
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Maarten Breddels


The current version is using a lookup table for doing the case conversion. Using [http://quick-bench.com/JaDErmVCY23Z1tu6YZns_KBt0qU] it seems using a boolean check and +/-32 seems ~5x times faster (4.6x for clang 9, 6.4x for GCC  9.2).

 



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