gabotechs commented on PR #19761:
URL: https://github.com/apache/datafusion/pull/19761#issuecomment-4016291704

   > perhaps we can think of an approach in the future (e.g. global 
work-stealing/morsel approach) that will limit the amount of prefetching / 
memory use.
   
   Sounds good. There's anyways some follow ups to be done here better handling 
when a dynamic filter cross the BufferExec, I can create some issues for 
tracking this.
   
   Created this for tracking future work:
   https://github.com/apache/datafusion/issues/20778


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