jayzhan211 commented on code in PR #13826:
URL: https://github.com/apache/datafusion/pull/13826#discussion_r1890161313
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datafusion/physical-plan/src/sorts/sort_preserving_merge.rs:
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@@ -105,6 +119,14 @@ impl SortPreservingMergeExec {
}
/// Sets the selection strategy of tied winners of the loser tree algorithm
+ ///
+ /// When true (the default) equal output rows are placed in the merged
+ /// stream when ready, which is faster but not stable (can vary from
+ /// run to run).
Review Comment:
Poll may be pending so value is not yet ready?
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