[GitHub] [arrow] pitrou commented on pull request #7418: ARROW-9115: [C++] Implementation of ascii_lower/ascii_upper by processing input data buffers in batch

[GitBox]

pitrou commented on pull request #7418:
URL: https://github.com/apache/arrow/pull/7418#issuecomment-643273901


   Before:
   ```
   AsciiLower   76218768 ns     76206752 ns           28 
bytes_per_second=207.921M/s items_per_second=13.7596M/s
   AsciiUpper   83254436 ns     83232143 ns           26 
bytes_per_second=190.371M/s items_per_second=12.5982M/s
   ```
   After:
   ```
   AsciiLower    4512754 ns      4510290 ns          483 
bytes_per_second=3.43073G/s items_per_second=232.485M/s
   AsciiUpper    4536864 ns      4534349 ns          462 
bytes_per_second=3.41253G/s items_per_second=231.252M/s
   ```
   


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