[GitHub] [arrow] lidavidm edited a comment on pull request #10557: ARROW-13064: [C++] Implement select ('case when') function for fixed-width types

[GitBox <gi...@apache.org>]

lidavidm edited a comment on pull request #10557:
URL: https://github.com/apache/arrow/pull/10557#issuecomment-875836424


   This is quite faster though (actually almost suspiciously so; also, the benchmark loop doesn't include constructing a structarray from individual boolean arrays).
   
   Struct:
   ```
   CaseWhenBench32/1048576/0               5780694 ns      5780134 ns          116 bytes_per_second=2.72434G/s
   CaseWhenBench64/1048576/0               6079444 ns      6078645 ns          115 bytes_per_second=5.16103G/s
   CaseWhenBench32/1048576/99              5717893 ns      5717306 ns          122 bytes_per_second=2.75402G/s
   CaseWhenBench64/1048576/99              6160254 ns      6159488 ns          110 bytes_per_second=5.09281G/s
   CaseWhenBench32Contiguous/1048576/0     1652127 ns      1645047 ns          423 bytes_per_second=7.19786G/s
   CaseWhenBench64Contiguous/1048576/0     1986278 ns      1986066 ns          334 bytes_per_second=11.8624G/s
   CaseWhenBench32Contiguous/1048576/99    1826875 ns      1826675 ns          377 bytes_per_second=6.48156G/s
   CaseWhenBench64Contiguous/1048576/99    2415119 ns      2414697 ns          312 bytes_per_second=9.75582G/s
   ```
   
   Alternating arguments: (EDIT: updated since I forgot to rebuild first)
   ```
   CaseWhenBench32/1048576/0              32471264 ns     32470765 ns           22 bytes_per_second=496.601M/s
   CaseWhenBench64/1048576/0              33443346 ns     33443152 ns           21 bytes_per_second=960.585M/s
   CaseWhenBench32/1048576/99             33171599 ns     33171474 ns           21 bytes_per_second=486.065M/s
   CaseWhenBench64/1048576/99             33970437 ns     33969940 ns           21 bytes_per_second=945.6M/s
   CaseWhenBench32Contiguous/1048576/0     7543780 ns      7543809 ns           92 bytes_per_second=1.56961G/s
   CaseWhenBench64Contiguous/1048576/0     7982627 ns      7982575 ns           86 bytes_per_second=2.95137G/s
   CaseWhenBench32Contiguous/1048576/99    7894886 ns      7894844 ns           89 bytes_per_second=1.49968G/s
   CaseWhenBench64Contiguous/1048576/99    8419204 ns      8419033 ns           82 bytes_per_second=2.79811G/s
   ```


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