Dandandan commented on PR #23492:
URL: https://github.com/apache/datafusion/pull/23492#issuecomment-5175612108

   > What can we expect for memory consumption? Will we use more memory because 
we prefetch?
   
   Yes. The extra memory consumption is pretty low (and can be configured) - it 
is roughly max the IO budget x partitions (probably slightly higher because of 
overhead / Tokio tasks running, but generally much lower).
   
   Thus 16 (partitions/cores) * 8 MiB  = ~128 MiB
   


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