askoa commented on code in PR #3103:
URL: https://github.com/apache/arrow-rs/pull/3103#discussion_r1021437579


##########
parquet/src/file/metadata.rs:
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@@ -940,6 +974,48 @@ impl OffsetIndexBuilder {
     }
 }
 
+/// Metadata for sorting order for columns
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct SortingColumnMetaData {

Review Comment:
   I followed the current notation of having two structs `RowGroup` for thrift 
read/write and `RowGroupMetaData` in `FieldMetaData`. `SortingColumn` is used 
in thrift read/write and `SortingColumnMetaData` in `FileMetaData`. I am going 
to keep this as is.



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