yyy1000 commented on code in PR #10690:
URL: https://github.com/apache/datafusion/pull/10690#discussion_r1617253512


##########
datafusion/sql/src/unparser/plan.rs:
##########
@@ -271,8 +273,39 @@ impl Unparser<'_> {
                     relation,
                 )
             }
-            LogicalPlan::Distinct(_distinct) => {
-                not_impl_err!("Unsupported operator: {plan:?}")
+            LogicalPlan::Distinct(distinct) => {
+                let (select_distinct, input) = match distinct {
+                    Distinct::All(input) => (ast::Distinct::Distinct, 
input.as_ref()),
+                    Distinct::On(on) => {
+                        let exprs = on
+                            .on_expr
+                            .iter()
+                            .map(|e| self.expr_to_sql(e))
+                            .collect::<Result<Vec<_>>>()?;
+                        let items = on
+                            .select_expr
+                            .iter()
+                            .map(|e| self.select_item_to_sql(e))
+                            .collect::<Result<Vec<_>>>()?;
+                        match &on.sort_expr {
+                            Some(sort_expr) => {
+                                if let Some(query_ref) = query {
+                                    query_ref
+                                        
.order_by(self.sort_to_sql(sort_expr.clone())?);
+                                } else {
+                                    return internal_err!(
+                                "Sort operator only valid in a statement 
context."
+                            );

Review Comment:
   Cool. Yeah, by running test I found sort_expr will be added to distinct_on 
plan, but it will not be added to sort.🤔
   Do you think it's better to remove `SelectBuilder::sort_by` or keep it?



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