Ted-Jiang commented on PR #4616:
URL: 
https://github.com/apache/arrow-datafusion/pull/4616#issuecomment-1352516495

   > I think in the long run breaking the update_batch and retract_batch API 
makes code hard to maintain. 
   
   Yes, I agree with this. Now window function with agg reuse the aggExpr, if 
we try to imply `retract_batch` for min max, i think it will also break a lot 
of api for avoiding effect the efficiency of non custom window frames 
situation. So I prefer keep this alone, is there any solution🤔
   
   > I think this data structure is better for our use case 
   
   Yes, you are right, from the paper why need `stores all batch at the 
beginning ` i think it will make `inter-partition parallelism` (but not in this 
pr 😂)
   


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