rluvaton commented on code in PR #15022:
URL: https://github.com/apache/datafusion/pull/15022#discussion_r2049451786
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datafusion/expr-common/src/groups_accumulator.rs:
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@@ -106,6 +107,44 @@ impl EmitTo {
/// [`Accumulator`]: crate::accumulator::Accumulator
/// [Aggregating Millions of Groups Fast blog]:
https://arrow.apache.org/blog/2023/08/05/datafusion_fast_grouping/
pub trait GroupsAccumulator: Send {
+ /// Whether [`Self::with_group_indices_order_mode`] should be called.
+ ///
+ /// this is when the accumulator would benefit from knowing the order of
the group indices.
+ ///
+ fn group_order_sensitivity(&self) -> bool {
Review Comment:
the problem with `*_input_order_mode` gives the sense that the input batches
are sorted while they are not
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