geoffreyclaude commented on PR #25372:
URL: https://github.com/apache/datafusion/pull/25372#issuecomment-6192538006

   I found a performance follow-up: recalculating retained-buffer memory scans 
every merge input for each batch. #26366 makes these updates constant-time 
while preserving the reservations. The included SQL benchmark improves from 
4.82 s to 1.30 s locally.
   @EmilyMatt and @andygrove, since you're obviously familiar with this part of 
the code, would you mind taking a look? 🙇 


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