tustvold commented on a change in pull request #1195:
URL: https://github.com/apache/arrow-rs/pull/1195#discussion_r787576858



##########
File path: arrow/src/compute/kernels/comparison.rs
##########
@@ -2794,6 +2890,177 @@ mod tests {
         );
     }
 
+    macro_rules! test_binary {
+        ($test_name:ident, $left:expr, $right:expr, $op:expr, $expected:expr) 
=> {
+            #[test]
+            fn $test_name() {
+                let left = BinaryArray::from_vec($left);
+                let right = BinaryArray::from_vec($right);
+                let res = $op(&left, &right).unwrap();
+                let expected = $expected;
+                assert_eq!(expected.len(), res.len());
+                for i in 0..res.len() {
+                    let v = res.value(i);
+                    assert_eq!(v, expected[i]);
+                }
+
+                let left = LargeBinaryArray::from_vec($left);

Review comment:
       Nice extra coverage :+1: 

##########
File path: arrow/src/compute/kernels/comparison.rs
##########
@@ -2794,6 +2890,177 @@ mod tests {
         );
     }
 
+    macro_rules! test_binary {
+        ($test_name:ident, $left:expr, $right:expr, $op:expr, $expected:expr) 
=> {
+            #[test]
+            fn $test_name() {
+                let left = BinaryArray::from_vec($left);
+                let right = BinaryArray::from_vec($right);
+                let res = $op(&left, &right).unwrap();
+                let expected = $expected;
+                assert_eq!(expected.len(), res.len());
+                for i in 0..res.len() {
+                    let v = res.value(i);
+                    assert_eq!(v, expected[i]);
+                }
+
+                let left = LargeBinaryArray::from_vec($left);
+                let right = LargeBinaryArray::from_vec($right);
+                let res = $op(&left, &right).unwrap();
+                let expected = $expected;
+                assert_eq!(expected.len(), res.len());
+                for i in 0..res.len() {
+                    let v = res.value(i);
+                    assert_eq!(v, expected[i]);
+                }
+            }
+        };
+    }
+
+    #[test]
+    fn test_binary_eq_scalar_on_slice() {

Review comment:
       :heart: 

##########
File path: arrow/src/compute/kernels/comparison.rs
##########
@@ -2794,6 +2890,177 @@ mod tests {
         );
     }
 
+    macro_rules! test_binary {
+        ($test_name:ident, $left:expr, $right:expr, $op:expr, $expected:expr) 
=> {
+            #[test]
+            fn $test_name() {
+                let left = BinaryArray::from_vec($left);
+                let right = BinaryArray::from_vec($right);
+                let res = $op(&left, &right).unwrap();
+                let expected = $expected;
+                assert_eq!(expected.len(), res.len());
+                for i in 0..res.len() {
+                    let v = res.value(i);
+                    assert_eq!(v, expected[i]);
+                }
+
+                let left = LargeBinaryArray::from_vec($left);
+                let right = LargeBinaryArray::from_vec($right);
+                let res = $op(&left, &right).unwrap();
+                let expected = $expected;
+                assert_eq!(expected.len(), res.len());
+                for i in 0..res.len() {
+                    let v = res.value(i);
+                    assert_eq!(v, expected[i]);
+                }
+            }
+        };
+    }
+

Review comment:
       It might be worth testing with some non-UTF-8 values, i.e. &[u8], just 
mix in some stuff in the range `b < 128 || b >= 192` which indicate UTF-8 
continuation characters.




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