alamb commented on a change in pull request #386:
URL: https://github.com/apache/arrow-rs/pull/386#discussion_r645151105
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File path: arrow/src/compute/kernels/window.rs
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@@ -33,56 +35,120 @@ use crate::{array::PrimitiveArray,
datatypes::ArrowPrimitiveType, error::Result}
/// use arrow::compute::shift;
///
/// let a: Int32Array = vec![Some(1), None, Some(4)].into();
+///
/// // shift array 1 element to the right
/// let res = shift(&a, 1).unwrap();
/// let expected: Int32Array = vec![None, Some(1), None].into();
-/// assert_eq!(res.as_ref(), &expected)
+/// assert_eq!(res.as_ref(), &expected);
+///
+/// // shift array 1 element to the left
+/// let res = shift(&a, -1).unwrap();
+/// let expected: Int32Array = vec![None, Some(4), None].into();
+/// assert_eq!(res.as_ref(), &expected);
+///
+/// // shift array 0 element, although not recommended
Review comment:
😆
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