[test](cte)add recursive cte test case (#59352)

[test](cte)add recursive cte test case

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- Test <!-- At least one of them must be included. -->
    - [ ] Regression test
    - [ ] Unit Test
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Author: zfr9527

regression-test/suites/recursive_cte/column_attribute_null_test.groovy

@@ -0,0 +1,94 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("column_attribute_null_test") {
+
+    String db = context.config.getDbNameByFile(context.file)
+    def prefix_str = "column_attribute_null_"
+    def tb_name = prefix_str + "recursive_cte_tb"
+    def temp_cte_name = prefix_str + "temp_cte_result"
+
+    sql """drop table if exists ${tb_name}"""
+    sql """CREATE TABLE ${tb_name} (
+            EmployeeID INT not null,
+            Name VARCHAR(50)  not NULL,
+            ManagerID INT not NULL
+        ) DUPLICATE KEY(EmployeeID) 
+        DISTRIBUTED BY HASH(EmployeeID) 
+        BUCKETS 3 PROPERTIES ('replication_num' = '1');"""
+
+    sql """INSERT INTO ${tb_name} VALUES 
+        (100, 'Manager X', 0), 
+        (101, 'Alice', 100), 
+        (102, 'Bob', 100), 
+        (103, 'Charlie', 101), 
+        (104, 'David', 103), 
+        (105, 'Eve', 101);"""
+
+
+    sql """drop view if exists ${temp_cte_name}"""
+    sql """
+        CREATE VIEW ${temp_cte_name} AS 
+        WITH recursive SubordinateHierarchy (
+            EmployeeID, 
+            EmployeeName, 
+            ManagerID, 
+            Level,
+            Comments
+        )
+        AS
+        (
+            SELECT 
+                EmployeeID, 
+                Name AS EmployeeName, 
+                ManagerID, 
+                cast(0 as bigint) AS Level,
+                CAST(NULL AS VARCHAR(100)) AS Comments 
+            FROM 
+                ${tb_name}
+            WHERE 
+                EmployeeID = 100
+                
+            UNION ALL
+            
+            SELECT 
+                E.EmployeeID, 
+                E.Name AS EmployeeName, 
+                E.ManagerID, 
+                cast(H.Level + 1 as bigint) AS Level,
+                cast(H.EmployeeName as VARCHAR(100))
+            FROM 
+                ${tb_name} AS E
+            INNER JOIN 
+                SubordinateHierarchy AS H
+                ON E.ManagerID = H.EmployeeID
+        )
+        SELECT 
+            *
+        FROM 
+            SubordinateHierarchy
+        ORDER BY 
+            Level, EmployeeID;
+    """
+
+    def desc_res = sql """desc ${temp_cte_name}"""
+    logger.info("desc_res: " + desc_res)
+    for (int i = 0; i < desc_res.size(); i++) {
+        assertTrue(desc_res[i][4] == null)
+    }
+
+}