jorisvandenbossche commented on PR #38784:
URL: https://github.com/apache/arrow/pull/38784#issuecomment-1825309706

   Neither of them shows an improvement .. 
   You can find the plot I am looking at by going to "full Conbench report" -> 
"Pull Request Run on ursa-i9-9960x at [2023-11-23 
15:46:24Z](https://conbench.ursa.dev/runs/34aee21814944f278f429aaad8bbe948)" 
(in section "All benchmark runs analyzed:" on that page) -> "compare to 
baseline run from fork point commit (recommended)" -> sort on benchmark name -> 
find "file-read" for "compression=snappy, dataset=fanniemae_2016Q4, 
file_type=parquet, language=R, output_type=table" (typically around page 7)
   
   (or if there is actually an improvement, you can also sort by "z-score" with 
positive values first)
   
   For the three runs, I get those three pages:
   
   * 
https://conbench.ursa.dev/compare/benchmark-results/0655f5af97857ba780005944ff57195f...0655f85d79c77f8e8000bec63a9a83ff/
   * 
https://conbench.ursa.dev/compare/benchmark-results/0655f5adc28975398000ef0b9ea87352...0655fb3943c77f648000b1280c84716e/
   * 
https://conbench.ursa.dev/compare/benchmark-results/0655f5adc28975398000ef0b9ea87352...065603346d0f7c1b800042fdd468a614/
   
   I am also not fully sure the R version seems to show a much bigger slowdown 
than the Python version 
(https://conbench.ursa.dev/compare/benchmark-results/0655f5af97857ba780005944ff57195f...0655f85d79c77f8e8000bec63a9a83ff/
 vs 
https://conbench.ursa.dev/compare/benchmark-results/0655f5263a32767a80008e5f53bf5830...0655f7d37080706a80000b9cc3264c89/),
 because they are both reading the same file with same compression, both into a 
table (so no conversion to Python pandas DataFrame or R data.frame).


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