zanmato1984 commented on issue #45393:
URL: https://github.com/apache/arrow/issues/45393#issuecomment-2629271372

   OK, I managed to learn some of our R benchmarking code and re-interpret the 
benchmark result. This is indeed a regression/bug.
   
   The comparison of the benchmark is done via 
https://github.com/voltrondata-labs/arrowbench/blob/deacdebc64bb5c04f8976138c45db96710e56e77/R/bm-tpc-h.R#L107C24-L107C38:
   ```
   all_equal_out <- waldo::compare(result, answer, tolerance = 0.01)
   ```
   And according to the waldo doc (https://waldo.r-lib.org/), the "old" in the 
report is actually the first argument (`result`) and the "new" the second 
(`answer`). So apparently the bug turned the all-zero `l_shippriority` column 
into some arbitrary non-zero values.
   
   I'll definitely look into it once I'm back. Thanks.


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