EmilyMatt commented on code in PR #11982:
URL: https://github.com/apache/arrow-rs/pull/11982#discussion_r4435489370


##########
parquet/src/arrow/arrow_writer/byte_array.rs:
##########
@@ -85,26 +113,9 @@ macro_rules! downcast_op {
             DataType::BinaryView => {
                 
$op($array.as_any().downcast_ref::<BinaryViewArray>().unwrap()$(, $arg)*)
             }
-            DataType::Dictionary(key, value) => match value.as_ref() {
-                DataType::Utf8 => downcast_dict_op!(key, StringArray, $array, 
$op$(, $arg)*),
-                DataType::LargeUtf8 => {
-                    downcast_dict_op!(key, LargeStringArray, $array, $op$(, 
$arg)*)
-                }
-                DataType::Utf8View => {
-                    downcast_dict_op!(key, StringViewArray, $array, $op$(, 
$arg)*)
-                }
-                DataType::Binary => downcast_dict_op!(key, BinaryArray, 
$array, $op$(, $arg)*),
-                DataType::LargeBinary => {
-                    downcast_dict_op!(key, LargeBinaryArray, $array, $op$(, 
$arg)*)
-                }
-                DataType::BinaryView => {
-                    downcast_dict_op!(key, BinaryViewArray, $array, $op$(, 
$arg)*)
-                }
-                DataType::FixedSizeBinary(_) => {
-                    downcast_dict_op!(key, FixedSizeBinaryArray, $array, 
$op$(, $arg)*)
-                }
-                d => unreachable!("cannot downcast {} dictionary value to byte 
array", d),
-            },
+            DataType::Dictionary(key, value) => {
+                downcast_dict_values_op!(key, value, $array, $op$(, $arg)*)
+            }

Review Comment:
   It isn't just moved, it is now called from a different place. the 
alternative is having a fully copy of it^^



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