jorgecarleitao commented on a change in pull request #8664:
URL: https://github.com/apache/arrow/pull/8664#discussion_r530329221
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File path: rust/arrow/src/compute/kernels/aggregate.rs
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@@ -141,32 +146,41 @@ where
match array.data().null_buffer() {
None => {
- let sum = data.iter().fold(T::default_value(), |accumulator,
value| {
- accumulator + *value
- });
+ let total = data
+ .par_iter()
Review comment:
`rayon` is pretty smart in this respect, as its execution model starts
the first part of the iterator immediately.
I am thankful that @vertexclique introduced this, as I also believe that we
greatly benefit from multi-threading at this level.
What I am a bit unsure is whether there is any issue in nested spawning: we
may want to fork in other places that are nested with this op. But I am
confident that someone knows the answer (👀 to @vertexclique and @alamb).
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