zanmato1984 commented on issue #41813:
URL: https://github.com/apache/arrow/issues/41813#issuecomment-2167220174

   I reproduced the bug in C++ and found about the same thing. (For anyone who 
is interested, checkout my repro branch 
https://github.com/zanmato1984/arrow/tree/fix-41813. Note you'll still need the 
data in the repro archive.)
   
   The bug seems to be that the group ids in the swiss table used by 
`GrouperFastImpl` are somehow wrong, causing the right rows obtained from it to 
be nonsense. Still digging.


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