[GitHub] [arrow] pitrou commented on pull request #13265: ARROW-16613: [C++][Parquet] Fix performance of repeated calls to AppendRowGroups()

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

pitrou commented on PR #13265:
URL: https://github.com/apache/arrow/pull/13265#issuecomment-1141262609

   Using the test script from https://github.com/apache/arrow/pull/13234#issue-1248714863:
   
   * on git master:
   ```
   Created Example File
   1 took 0.116 seconds
   2 took 0.457 seconds
   3 took 1.818 seconds
   4 took 8.796 seconds
   
   real	0m11,476s
   user	0m11,665s
   sys	0m1,140s
   ```
   
   * with this PR:
   ```
   Created Example File
   1 took 0.002 seconds
   2 took 0.004 seconds
   3 took 0.007 seconds
   4 took 0.015 seconds
   
   real	0m0,313s
   user	0m0,579s
   sys	0m1,246s
   ```
   
   * with PR https://github.com/apache/arrow/pull/13234:
   ```
   Created Example File
   1 took 0.002 seconds
   2 took 0.003 seconds
   3 took 0.007 seconds
   4 took 0.015 seconds
   
   real	0m0,336s
   user	0m0,604s
   sys	0m1,207s
   ```


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