crepererum commented on issue #3941:
URL: 
https://github.com/apache/arrow-datafusion/issues/3941#issuecomment-1290334270

   I think it's OK to have some slack room on top of the limit, which is 
somewhat controlled by the batch size. It's unlikely that we are going to 
account for every single byte anyways, since there might be some aux data 
structures here and there that are heap-allocated. So I would treat this is a 
"best effort limit w/o impacting performance (too much)".
   
   We could later (if there's demand for it) add a config option "strict memory 
enforcement" that impacts performance.


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