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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