Rachelint commented on code in PR #13681:
URL: https://github.com/apache/datafusion/pull/13681#discussion_r1933239306
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datafusion/functions-aggregate/src/median.rs:
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@@ -230,6 +276,212 @@ impl<T: ArrowNumericType> Accumulator for
MedianAccumulator<T> {
}
}
+/// The median groups accumulator accumulates the raw input values
+///
+/// For calculating the accurate medians of groups, we need to store all values
+/// of groups before final evaluation.
+/// So values in each group will be stored in a `Vec<T>`, and the total group
values
+/// will be actually organized as a `Vec<Vec<T>>`.
+///
+#[derive(Debug)]
+struct MedianGroupsAccumulator<T: ArrowNumericType + Send> {
+ data_type: DataType,
+ group_values: Vec<Vec<T::Native>>,
Review Comment:
@korowa it means impl a `group accumulator` for `distinct count` not get a
obviously improvement?
It is really surprise for me, I am learning
https://github.com/apache/datafusion/pull/8721
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