sunchao commented on PR #5505:
URL: 
https://github.com/apache/datafusion-comet/pull/5505#issuecomment-5982551991

   Confirmed against current main `ac9ae94d057013095fdf1b70e2d4bc5b24a58d90`: 
`releasePlan` stops `BatchProducer` and drops its stream before 
`update_metrics`, then drops the execution context and waits for its plan 
reservations to be released. The remaining-reservation timeout is already 
logged at `warn!`. This preserves the RAII pool-registration cleanup as well.
   
   That covers this PR's cancellation/metrics ordering problem more completely 
than its old 100 ms cancellation-only wait, as noted in #6261. There is no 
remaining implementation change to carry forward from this branch, so rebasing 
it would duplicate the stronger upstream fix. Leaving the PR open for the 
author's closure decision.
   


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