westonpace commented on code in PR #7446:
URL: https://github.com/apache/arrow-rs/pull/7446#discussion_r2071855486


##########
parquet/src/arrow/arrow_writer/mod.rs:
##########
@@ -1911,6 +1914,29 @@ mod tests {
         roundtrip(batch, Some(SMALL_SIZE / 2));
     }
 
+    #[test]
+    fn test_fixed_size_binary_in_dict() {
+        let field = Field::new(
+            "a",
+            DataType::Dictionary(
+                Box::new(DataType::UInt8),
+                Box::new(DataType::FixedSizeBinary(4)),
+            ),

Review Comment:
   Just to be thorough can we iterate through the various key types to ensure 
we got the match statement in byte_array_dictionary correct?



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