avantgardnerio commented on PR #23167:
URL: https://github.com/apache/datafusion/pull/23167#issuecomment-4794768587

   > if the first batch is a small batch and subsequent are large ones
   
   The idea is that the `PipelineBreakerBuffer` only comes after pipeline 
breakers - which consume everything before emitting 1 batch; natural stage 
barriers within our existing plans. By the time 
`PipelineBreakerBuffer::is_ready() == true`, we know the exact stats from the 
leaf, not 1 batch approximation.


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