ide: fix stack overflow with cte column hover that shadows a table (#786)

Author: sbdchd

crates/squawk_ide/src/hover.rs

@@ -1581,4 +1581,18 @@ select a$0 from y;
           ╰╴       ─ hover
         ");
     }
+
+    #[test]
+    fn hover_on_cte_shadowing_table_with_star() {
+        assert_snapshot!(check_hover("
+create table t(a bigint);
+with t as (select * from t)
+select a$0 from t;
+"), @r"
+        hover: column public.t.a bigint
+          ╭▸ 
+        4 │ select a from t;
+          ╰╴       ─ hover
+        ");
+    }
 }

crates/squawk_ide/src/resolve.rs

@@ -851,7 +851,11 @@ fn resolve_cte_column(
                         {
                             let from_table_name =
                                 Name::new(from_name_ref.syntax().text().to_string());
-                            return resolve_cte_column(name_ref, &from_table_name, column_name);
+                            // Skip recursive CTE lookup if the FROM table has the same name as the current CTE
+                            // (CTEs don't shadow themselves in their own definition)
+                            if from_table_name != *cte_name {
+                                return resolve_cte_column(name_ref, &from_table_name, column_name);
+                            }
                         }
                     }
                 }