removed (#14370)

Author: buraksenn

datafusion/common/src/utils/mod.rs

@@ -769,20 +769,6 @@ pub fn set_difference<T: Borrow<usize>, S: Borrow<usize>>(
         .collect()
 }
 
-/// Checks whether the given index sequence is monotonically non-decreasing.
-pub fn is_sorted<T: Borrow<usize>>(sequence: impl IntoIterator<Item = T>) -> bool {
-    // TODO: Remove this function when `is_sorted` graduates from Rust nightly.
-    let mut previous = 0;
-    for item in sequence.into_iter() {
-        let current = *item.borrow();
-        if current < previous {
-            return false;
-        }
-        previous = current;
-    }
-    true
-}
-
 /// Find indices of each element in `targets` inside `items`. If one of the
 /// elements is absent in `items`, returns an error.
 pub fn find_indices<T: PartialEq, S: Borrow<T>>(
@@ -1171,18 +1157,6 @@ mod tests {
         assert_eq!(set_difference([3, 4, 0], [4, 1, 2]), vec![3, 0]);
     }
 
-    #[test]
-    fn test_is_sorted() {
-        assert!(is_sorted::<usize>([]));
-        assert!(is_sorted([0]));
-        assert!(is_sorted([0, 3, 4]));
-        assert!(is_sorted([0, 1, 2]));
-        assert!(is_sorted([0, 1, 4]));
-        assert!(is_sorted([0usize; 0]));
-        assert!(is_sorted([1, 2]));
-        assert!(!is_sorted([3, 2]));
-    }
-
     #[test]
     fn test_find_indices() -> Result<()> {
         assert_eq!(find_indices(&[0, 3, 4], [0, 3, 4])?, vec![0, 1, 2]);