andygrove commented on issue #15323:
URL: https://github.com/apache/datafusion/issues/15323#issuecomment-2781458966

   > I have a working version locally and will create a PR soon, just one 
problem, I don't think we can know the number of blocking threads tokio is 
configured with.
   > 
   > this is important as for example Comet set this by default to 10, and 
tokio default is 512 IIRC.
   > 
   > the working version can be improved with some optimization like prefetch 
and more, but it will be good enough for now and we can iterate further  
   
   Comet currently creates a new tokio runtime per plan but there is a proposal 
to move to a global tokio runtime (per executor) instead.
   
   https://github.com/apache/datafusion-comet/issues/1590


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