alamb commented on code in PR #7815:
URL: https://github.com/apache/arrow-rs/pull/7815#discussion_r2283084836


##########
arrow-cast/src/cast/mod.rs:
##########
@@ -2655,6 +2875,72 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_cast_decimal32_to_decimal32() {

Review Comment:
   I was confused for a few moments trying to understand what this was trying 
to test. Perhaps a comment would help (likewise for the test below)
   
   ```suggestion
       fn test_cast_decimal32_to_decimal32() {
         // test changing precision
   ```



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