robtandy commented on code in PR #13862:
URL: https://github.com/apache/datafusion/pull/13862#discussion_r1894418929


##########
datafusion/substrait/src/logical_plan/producer.rs:
##########
@@ -368,14 +368,45 @@ pub fn to_substrait_rel(
                 .iter()
                 .map(|e| substrait_sort_field(state, e, sort.input.schema(), 
extensions))
                 .collect::<Result<Vec<_>>>()?;
-            Ok(Box::new(Rel {
+
+            let sort_rel = Box::new(Rel {
                 rel_type: Some(RelType::Sort(Box::new(SortRel {
                     common: None,
                     input: Some(input),
                     sorts: sort_fields,
                     advanced_extension: None,
                 }))),
-            }))
+            });
+
+            match sort.fetch {
+                Some(_) => {
+                    let empty_schema = Arc::new(DFSchema::empty());
+                    let count_mode = sort
+                        .fetch
+                        .map(|amount| {

Review Comment:
   ty for the suggestions!  Heading to dinner now and I can address these 
tomorrow morning eastern time. 



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