Dandandan commented on a change in pull request #9776:
URL: https://github.com/apache/arrow/pull/9776#discussion_r599302014



##########
File path: rust/datafusion/src/sql/planner.rs
##########
@@ -114,7 +115,17 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
         alias: Option<String>,
     ) -> Result<LogicalPlan> {
         let set_expr = &query.body;
-        let plan = self.set_expr_to_plan(set_expr, alias)?;
+        let ctes: HashMap<String, Query> = query
+            .clone()
+            .with
+            .map(|with| {
+                with.cte_tables

Review comment:
       This needs to be converted to a logical plan here already and only allow 
backward references




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