renyd123 commented on issue #42097:
URL: https://github.com/apache/arrow/issues/42097#issuecomment-2163382723

   > Aha. so a thread only handle one `ReadTable` call? Basically, if 
encryption is not enabled, and file doesn't on object-store, `ReadTable` is 
probably a cpu-bound task...I'll try to repro on my 3800x...
   
   yes,  16 threads handle 16 RowGroups in parallel. And columns are processed 
serially in each thread.


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