justinli500 commented on PR #49855:
URL: https://github.com/apache/arrow/pull/49855#issuecomment-4825036765

   Got it - in that case, I'll pivot to your approach and start working on it 
now. Going to key eviction off `pre_buffer()` in the `GetRecordBatchGenerator` 
path so the Dataset/#39808 case is covered, and will use the offset-watermark 
so that merged cross-row-group entries free by construction.


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