GregBowyer commented on a change in pull request #8698:
URL: https://github.com/apache/arrow/pull/8698#discussion_r541457466



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File path: rust/parquet/src/data_type.rs
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@@ -229,6 +235,82 @@ impl fmt::Display for ByteArray {
     }
 }
 
+/// Wrapper type for performance reasons, this represents 
`FIXED_LEN_BYTE_ARRAY` but in all other
+/// considerations behaves the same as `ByteArray`
+#[repr(transparent)]
+#[derive(Clone, Debug, Default)]
+pub struct FixedLenByteArray(ByteArray);

Review comment:
       I copied the above comment in wholesale




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