fix: materialized cte is defined but not be used (#13046)

src/query/sql/src/planner/binder/binder.rs

@@ -181,7 +181,7 @@ impl<'a> Binder {
                 let (mut s_expr, bind_context) = self.bind_query(bind_context, query).await?;
                 // Wrap `LogicalMaterializedCte` to `s_expr`
                 for (_, cte_info) in self.ctes_map.iter().rev() {
-                    if !cte_info.materialized {
+                    if !cte_info.materialized || cte_info.used_count == 0{
                         continue;
                     }
                     let cte_s_expr = self.m_cte_bound_s_expr.get(&cte_info.cte_idx).unwrap();

tests/sqllogictests/suites/query/materialized_cte.test

@@ -189,3 +189,19 @@ with t1 as materialized (select number as a from numbers(10)), t2 as materialize
 0
 0
 0
+
+statement ok
+create table test (a int, b string);
+
+statement ok
+insert into test values (1, 'a'), (2, 'b');
+
+# main query doesn't use materialized cte, but materialized cte is defined
+query TT rowsort
+WITH tq9v2(cHAx0) AS materialized (SELECT a AS cHAx0 FROM test) SELECT b from test;
+----
+a
+b
+
+statement ok
+drop table test