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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/09/15 17:26:02 UTC

[GitHub] [arrow] pitrou commented on pull request #8177: ARROW-8494: [C++][Parquet] Full support for reading mixed list and structs

pitrou commented on pull request #8177:
URL: https://github.com/apache/arrow/pull/8177#issuecomment-692860379


   `parquet-level-conversion-benchmark`:
   * before:
   ```
   BM_DefinitionLevelsToBitmapRepeatedAllMissing         966 ns          966 ns       714328 bytes_per_second=1.9753G/s
   BM_DefinitionLevelsToBitmapRepeatedAllPresent        1626 ns         1626 ns       426358 bytes_per_second=1.173G/s
   BM_DefinitionLevelsToBitmapRepeatedMostPresent       1850 ns         1850 ns       367809 bytes_per_second=1055.83M/s
   ```
   * after:
   ```
   BM_DefinitionLevelsToBitmapRepeatedAllMissing         560 ns          560 ns      1239730 bytes_per_second=3.40515G/s
   BM_DefinitionLevelsToBitmapRepeatedAllPresent         562 ns          562 ns      1244256 bytes_per_second=3.39684G/s
   BM_DefinitionLevelsToBitmapRepeatedMostPresent        562 ns          562 ns      1244691 bytes_per_second=3.39515G/s
   ```
   
   Impressive!


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