jvanstraten opened a new pull request, #13509:
URL: https://github.com/apache/arrow/pull/13509

   The min/max aggregate compute kernels seemed to discard their state between 
partitions, so they would only aggregate the last partition they see (in each 
thread).
   
   This is the simplest change I could come up with to fix this, but honestly 
I'm not sure why the `local` variable even exists. It seems to me it could just 
be replaced with `this->state` directly, since there doesn't seem to be any 
failure path where `this->state` isn't updated from `local`. Am I missing 
something?


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