askoa commented on code in PR #3103:
URL: https://github.com/apache/arrow-rs/pull/3103#discussion_r1021424138


##########
parquet/src/file/metadata.rs:
##########
@@ -353,6 +377,15 @@ impl RowGroupMetaDataBuilder {
         self
     }
 
+    /// Sets the sorting order for columns
+    pub fn set_sorting_columns(
+        mut self,
+        value: Option<Vec<SortingColumnMetaData>>,
+    ) -> Self {
+        self.sorting_columns = value;

Review Comment:
   I got a reverse review before. The reason given by the reviewer was that if 
we remove `Option` from signature then the function cannot be used to set 
`None` for this field. I am going to keep this as is.



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