viirya commented on code in PR #8731:
URL: https://github.com/apache/arrow-datafusion/pull/8731#discussion_r1440929583
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datafusion/core/src/physical_optimizer/enforce_distribution.rs:
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@@ -1237,12 +1231,7 @@ fn ensure_distribution(
child = add_spm_on_top(child);
Review Comment:
@Dandandan Do we need the additional round robin for single partition? This
looks unnecessary as single partitioning is not costly as hash partitioning.
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