[GitHub] [arrow] alamb commented on pull request #8664: ARROW-10588: [Rust] Safe and parallel bit operations for Arrow

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alamb commented on pull request #8664:
URL: https://github.com/apache/arrow/pull/8664#issuecomment-733811489


   > Conceptually this is not a small change. Personally I think parallelizing on the datafusion level and keeping kernels single-threaded is the better model.
   
   I agree with @jhorstmann 's opinion here -- I think we should keep arrow single threaded (parallelizing their invocation across record batches can be done at a higher level).
   
   One challenge of adding parallelism like rayon at a lower level such as the kernel is that the higher level libraries or applications lose control of the resources (for example, if some app wanted a particular background operation with only  a single core on a multi core, they couldn't do that easily with the code in this PR anymore)


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