test: add nested bracket test

test/utils/index.test.ts

@@ -27,6 +27,29 @@ describe('utils', () => {
         expect(result.length).toEqual(2);
     });
 
+    // test nested bracket
+    test('split nested bracket sql', () => {
+        const sql = `WITH cte_sales_amounts (staff, sales, year) 
+        AS 
+        (
+            SELECT    
+                first_name + ' ' + last_name, 
+                SUM(quantity * list_price * (1 - discount)),
+                YEAR(order_date)
+            FROM    
+                sales.orders o
+            INNER JOIN sales.order_items i ON i.order_id = o.order_id
+            INNER JOIN sales.staffs s ON s.staff_id = o.staff_id
+        )
+        SELECT staff, sales
+        FROM cte_sales_amounts
+        WHERE year = 2018;
+        SELECT * FROM table;`;
+        const result = splitSql(sql);
+        console.log(JSON.stringify(result));
+        expect(result.length).toEqual(2);
+    });
+
     test('lexer', () => {
         const sql = `-- a ;
         select * from a;