matthewmturner commented on a change in pull request #984:
URL: https://github.com/apache/arrow-rs/pull/984#discussion_r758597314



##########
File path: arrow/src/compute/kernels/comparison.rs
##########
@@ -200,6 +201,42 @@ macro_rules! compare_op_scalar_primitive {
     }};
 }
 
+macro_rules! compare_dict_op_scalar {
+    ($left:expr, $right:expr, $op:expr) => {{
+        let null_bit_buffer = $left
+            .data()
+            .null_buffer()
+            .map(|b| b.bit_slice($left.offset(), $left.len()));
+
+        let values = $left
+            .values()
+            .as_any()
+            .downcast_ref::<StringArray>()

Review comment:
       from my understanding of the dyn kernels those cant be used when 
comparing to constant right?




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