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  1. Apache Arrow
  2. ARROW-9131

[C++] Faster ascii_lower and ascii_upper

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 1.0.0
    • C++

    Description

      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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              maartenbreddels Maarten Breddels
              maartenbreddels Maarten Breddels
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