alamb commented on code in PR #7832:
URL: https://github.com/apache/arrow-rs/pull/7832#discussion_r2177268965


##########
arrow-avro/src/reader/record.rs:
##########
@@ -732,4 +838,122 @@ mod tests {
         assert_eq!(list_arr.len(), 1);
         assert_eq!(list_arr.value_length(0), 0);
     }
+
+    #[test]
+    fn test_decimal_decoding_fixed256() {

Review Comment:
   I don't really have any way to verify that this is doing the right thing 
(like I don't know / have any way to verify if `row1` and `row2` byte arrays 
are valid avro)
   
   One thing I suggest (in a different PR) is starting to test that the reader 
will work "end to end". Specifically, at least these two cases:
   1.  Testing reading avro files written with other implementations
   2. Test "round tripping" arrow data from Arrow --> Avro --> Arrow and 
ensuring the same data has arrived
   
   @jecsand838 have you considered this type of testing?



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