mustafasrepo commented on code in PR #6904:
URL: https://github.com/apache/arrow-datafusion/pull/6904#discussion_r1260681595
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datafusion/physical-expr/src/aggregate/count.rs:
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@@ -76,6 +85,114 @@ impl Count {
}
}
+/// An accumulator to compute the counts of [`PrimitiveArray<T>`].
+/// Stores values as native types, and does overflow checking
+///
+/// Unlike most other accumulators, COUNT never produces NULLs. If no
+/// non-null values are seen in any group the output is 0. Thus, this
+/// accumulator has no additional null or seen filter tracking.
+#[derive(Debug)]
+struct CountGroupsAccumulator {
+ /// Count per group.
+ ///
+ /// Note this is an i64 and not a u64 (or usize) because the
+ /// output type of count is `DataType::Int64`. Thus by using `i64`
Review Comment:
Is there any reason for output type to be `DataType::Int64`?. Maybe in
following PRs we can convert output type to `DataType::UInt64`.
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