xavlee commented on code in PR #24697:
URL: https://github.com/apache/datafusion/pull/24697#discussion_r3915408722


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datafusion/physical-plan/src/aggregates/order/mod.rs:
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@@ -28,6 +28,33 @@ use crate::InputOrderMode;
 pub use full::GroupOrderingFull;
 pub use partial::GroupOrderingPartial;
 
+/// Describes how an aggregate can determine that groups are complete.
+///

Review Comment:
   Yeah agreed, I added a short example



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