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minor: More comments to AggregateMode::PartialReduce #22800

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minor: More comments to AggregateMode::PartialReduce #22800

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6 changes: 6 additions & 0 deletions datafusion/physical-plan/src/aggregates/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,12 @@ pub enum AggregateMode {
/// / \ / \
/// Partial Partial Partial Partial
/// ```
///
/// # Motivation
///
/// This reduces shuffling traffic in a distributed setting. See
/// <https://github.com/datafusion-contrib/datafusion-distributed/issues/360>
/// for details.
PartialReduce,
}

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