Dandandan commented on PR #9508:
URL: https://github.com/apache/arrow-rs/pull/9508#issuecomment-4017315221

   > This should be a change to the `debug_assert` to be `>=` rather than here 
I think? Reserving exact will increase memory fragmentation
   
   Btw - I didn't really understand this part? In this code using 
`reserve_exact` shouldn't lead to memory fragmentation?
   Note that we always target max `target_batch_size` in this code (it will 
never exceed this).


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