mapleFU commented on PR #39054:
URL: https://github.com/apache/arrow/pull/39054#issuecomment-1853564328

   I think this is a bit tricky and not commonly used, the problem is that this 
leaks the abstraction of `buffers` handling in `parquet::RecordReader`. 
Transfering it to same output-buffer is also bug-prone, it might introduce some 
undefined behavior if memcpy is used rather than memmove, which is very hard to 
debugging.
   
   Maybe I'd like to survey a better interface here?
   


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