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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/10/19 01:30:50 UTC

[GitHub] [spark] cloud-fan commented on pull request #38196: [SPARK-40703][SQL] Introduce shuffle on SinglePartition to improve parallelism

cloud-fan commented on PR #38196:
URL: https://github.com/apache/spark/pull/38196#issuecomment-1283252896

   late LGTM. I think this is good to fix the perf regression, but we probably need a better design to fix similar problems. What if the other side is `HashPartitioning(2)`? The parallelism can still be too low. We need some heuristic or cost model to make a better decision here.


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