aocsa commented on pull request #11017:
URL: https://github.com/apache/arrow/pull/11017#issuecomment-936473091


   LGTM too me too. I reviewed the code and there are some common patterns to 
handle signals, input_counter and future `finished` vars that Is common in 
different ExecNodes as sames as MapExecNode I think should documented 
somewhere, specially to the newbies that don't want to mess with race condition.


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