jorgecarleitao commented on a change in pull request #8946:
URL: https://github.com/apache/arrow/pull/8946#discussion_r544830660
##########
File path: rust/arrow/src/compute/kernels/aggregate.rs
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@@ -135,6 +137,40 @@ where
Some(n)
}
+/// Helper function to perform min/max lambda function on values from a
`BooleanArray`
+fn min_max_boolean<F>(array: &BooleanArray, cmp: F) -> Option<bool>
+where
+ F: Fn(bool, bool) -> bool,
+{
+ let null_count = array.null_count();
+
+ // Includes case array.len() == 0
+ if null_count == array.len() {
+ return None;
+ }
+
+ let m0: Option<bool> = array.iter().next().unwrap();
+
+ array.iter().fold(m0, |max, item| match (max, item) {
Review comment:
Good point. This is indeed simpler given the finite number of choices.
Something like `.any(item)` would short-circuit, I think.
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