Dandandan commented on code in PR #16136:
URL: https://github.com/apache/datafusion/pull/16136#discussion_r2100764581
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datafusion/physical-plan/src/aggregates/group_values/single_group_by/primitive/mod.rs:
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@@ -130,15 +133,15 @@ where
let hash = key.hash(state);
let insert = self.map.entry(
hash,
- |&(g, _)| unsafe {
self.values.get_unchecked(g).is_eq(key) },
Review Comment:
I wonder if the existing performance couldn't already be improved by doing
`h == hash && unsafe { self.values.get_unchecked(g).is_eq(key) }` (i.e.
avoiding the fetch if hash equality doesn't hold), like we do in other places.
This already filters out most of them as hashes are almost never the same.
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