pitrou opened a new issue, #36176:
URL: https://github.com/apache/arrow/issues/36176

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   Following GH-33206, a large performance regression appeared in single-key 
table sorting:
   ```
        ArraySortIndicesInt64Narrow/32768/10000      2.683 GiB/sec     2.165 
GiB/sec   -19.296                                   {'family_index': 0, 
'per_family_instance_index': 0, 'run_name': 
'ArraySortIndicesInt64Narrow/32768/10000', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 59563, 'null_percent': 0.01}
   TableSortIndicesInt64Narrow/1048576/100/1/32  16.175M items/sec 10.063M 
items/sec   -37.786 {'family_index': 12, 'per_family_instance_index': 9, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/100/1/32', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 11, 'chunks': 32.0, 
'columns': 1.0, 'null_percent': 1.0}
     TableSortIndicesInt64Narrow/1048576/4/1/32  19.455M items/sec 11.938M 
items/sec   -38.639 {'family_index': 12, 'per_family_instance_index': 10, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/4/1/32', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 13, 'chunks': 32.0, 
'columns': 1.0, 'null_percent': 25.0}
     TableSortIndicesInt64Narrow/1048576/0/1/32  18.017M items/sec 10.212M 
items/sec   -43.320  {'family_index': 12, 'per_family_instance_index': 11, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/0/1/32', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 12, 'chunks': 32.0, 
'columns': 1.0, 'null_percent': 0.0}
      TableSortIndicesInt64Narrow/1048576/4/1/4  35.396M items/sec 15.609M 
items/sec   -55.901   {'family_index': 12, 'per_family_instance_index': 22, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/4/1/4', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 25, 'chunks': 4.0, 
'columns': 1.0, 'null_percent': 25.0}
    TableSortIndicesInt64Narrow/1048576/100/1/4  34.966M items/sec 12.808M 
items/sec   -63.370  {'family_index': 12, 'per_family_instance_index': 21, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/100/1/4', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 23, 'chunks': 4.0, 
'columns': 1.0, 'null_percent': 1.0}
      TableSortIndicesInt64Narrow/1048576/0/1/4  36.230M items/sec 13.005M 
items/sec   -64.103    {'family_index': 12, 'per_family_instance_index': 23, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/0/1/4', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 24, 'chunks': 4.0, 
'columns': 1.0, 'null_percent': 0.0}
      TableSortIndicesInt64Narrow/1048576/4/1/1  87.635M items/sec 20.321M 
items/sec   -76.811   {'family_index': 12, 'per_family_instance_index': 34, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/4/1/1', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 58, 'chunks': 1.0, 
'columns': 1.0, 'null_percent': 25.0}
    TableSortIndicesInt64Narrow/1048576/100/1/1 151.551M items/sec 15.919M 
items/sec   -89.496  {'family_index': 12, 'per_family_instance_index': 33, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/100/1/1', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 99, 'chunks': 1.0, 
'columns': 1.0, 'null_percent': 1.0}
      TableSortIndicesInt64Narrow/1048576/0/1/1 177.335M items/sec 16.015M 
items/sec   -90.969   {'family_index': 12, 'per_family_instance_index': 35, 
'run_name': 'TableSortIndicesInt64Narrow/1048576/0/1/1', 'repetitions': 1, 
'repetition_index': 0, 'threads': 1, 'iterations': 117, 'chunks': 1.0, 
'columns': 1.0, 'null_percent': 0.0}
   ```
   
   
   
   ### Component(s)
   
   C++


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