alamb commented on PR #20820:
URL: https://github.com/apache/datafusion/pull/20820#issuecomment-4118167818

   Thanks @Dandandan ! I think the issue was a call to get the number of cores 
-- I fixed in 
[1b2e4b9](https://github.com/apache/datafusion/pull/20820/commits/1b2e4b9db4e49e8fcbdaea3a90e8652576472206)
   
   
   I am now going to experiment with using crossbeam queue / reducing the 
synchronization cost 
   
   If that goes well I'll figure out the intermittent test failures (I know 
what is wrong, I just need to figure out how to fix it) and then maybe start 
splitting up for review
   


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