Fix: outer CTEs should be available in subqueries

core/translate/planner.rs

@@ -317,11 +317,26 @@ fn parse_from_clause_table(
             )
         }
         ast::SelectTable::Select(subselect, maybe_alias) => {
+            let outer_query_refs_for_subquery = table_references
+                .outer_query_refs()
+                .iter()
+                .cloned()
+                .chain(
+                    ctes.iter()
+                        .cloned()
+                        .map(|t: JoinedTable| OuterQueryReference {
+                            identifier: t.identifier,
+                            internal_id: t.internal_id,
+                            table: t.table,
+                            col_used_mask: ColumnUsedMask::default(),
+                        }),
+                )
+                .collect::<Vec<_>>();
             let Plan::Select(subplan) = prepare_select_plan(
                 subselect,
                 resolver,
                 program,
-                table_references.outer_query_refs(),
+                &outer_query_refs_for_subquery,
                 QueryDestination::placeholder_for_subquery(),
                 connection,
             )?

testing/subquery.test

@@ -433,3 +433,17 @@ do_execsql_test subquery-count-all {
         where u.id < 100
     );
 } {1089}
+
+do_execsql_test_on_specific_db {:memory:} subquery-cte-available-in-arbitrary-depth {
+    with cte as (select 1 as one)
+    select onehundredandeleven+1 as onehundredandtwelve
+    from (
+        with cte2 as (select 10 as ten)
+        select onehundredandone+ten as onehundredandeleven
+        from (
+            with cte3 as (select 100 as hundred)
+            select one+hundred as onehundredandone
+            from cte join cte3
+        ) join cte2
+    );
+} {112}