alamb commented on a change in pull request #1129:
URL: https://github.com/apache/arrow-rs/pull/1129#discussion_r778779669
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File path: arrow/src/array/cast.rs
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@@ -21,7 +21,7 @@ use crate::array::*;
use crate::datatypes::*;
/// Force downcast ArrayRef to PrimitiveArray<T>
-pub fn as_primitive_array<T>(arr: &ArrayRef) -> &PrimitiveArray<T>
+pub fn as_primitive_array<T>(arr: &dyn Array) -> &PrimitiveArray<T>
Review comment:
FWIW this change means that calls that pass in a `&ArrayRef` will
generate an extra dispatch as pointed out by @tustvold on
https://github.com/apache/arrow-rs/issues/1128#issuecomment-1003747568 -- this
can be avoided by the user calling `as_primitive_array(arr.as_ref())` or
`as_primitive_array(&*arr)` if it is important to avoid the double dispatch
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