Dandandan commented on a change in pull request #275:
URL: https://github.com/apache/arrow-rs/pull/275#discussion_r629333194
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File path: arrow/src/compute/kernels/arity.rs
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@@ -72,3 +72,40 @@ where
let data = into_primitive_array_data::<_, O>(array, buffer);
PrimitiveArray::<O>::from(data)
}
+
+/// Applies a nullary and infalible function to generate a primitive array.
+/// You should use this instead of the vectorized version when each generated
value is different.
+pub fn nullary<F, O>(size: usize, op: F) -> PrimitiveArray<O>
+where
+ O: ArrowPrimitiveType,
+ F: Fn() -> O::Native,
+{
+ let values = (0..size).map(|_| op());
Review comment:
This could use `std::iter::repeat`
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