lidavidm commented on pull request #12080:
URL: https://github.com/apache/arrow/pull/12080#issuecomment-1005691660


   Right, you don't get to see the actual data during preallocation. However 
it's called from here: 
https://github.com/apache/arrow/blob/ecacff0f4e1059887ea6ff78254c4ae9ff3ea102/cpp/src/arrow/compute/exec.cc#L732
   
   It seems you could pass through the actual data in that case.


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