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Posted to github@arrow.apache.org by "tustvold (via GitHub)" <gi...@apache.org> on 2023/04/29 19:57:44 UTC

[GitHub] [arrow-datafusion] tustvold opened a new issue, #6162: Run SortPreservingMerge Inputs Concurrently

tustvold opened a new issue, #6162:
URL: https://github.com/apache/arrow-datafusion/issues/6162

   ### Is your feature request related to a problem or challenge?
   
   SortPreservingMerge currently interleaves the execution of its input streams, and as a result all its inputs will be evaluated serially.
   
   This is unfortunate if its inputs are performing a potentially expensive operation, such as decoding parquet.
   
   ### Describe the solution you'd like
   
   Perhaps we should do something similar to RepartitionExec and spawn the inputs into separate tokio tasks, allowing their execution to be scheduled in parallel
   
   ### Describe alternatives you've considered
   
   Longer-term a true morsel-driven concurrency story might be nice (#2504) and would avoid needing to manually parallelise operators such as SortPreservingMerge, however, this might be a shorter-term mechanism to boost performance.
   
   ### Additional context
   
   _No response_


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[GitHub] [arrow-datafusion] alamb commented on issue #6162: Run SortPreservingMerge Inputs Concurrently

Posted by "alamb (via GitHub)" <gi...@apache.org>.

alamb commented on issue #6162:
URL: https://github.com/apache/arrow-datafusion/issues/6162#issuecomment-1529712427

   Yes, this would be very nice


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[GitHub] [arrow-datafusion] tustvold closed issue #6162: Run SortPreservingMerge Inputs Concurrently

Posted by "tustvold (via GitHub)" <gi...@apache.org>.

tustvold closed issue #6162: Run SortPreservingMerge Inputs Concurrently
URL: https://github.com/apache/arrow-datafusion/issues/6162


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