crazyleeyang opened a new issue #5971:
URL: https://github.com/apache/incubator-doris/issues/5971


   **Describe the bug**
   left join时出现非预期结果
   
   **To Reproduce**
   **doris表1:sku_doris1**
   
   ```sql
   CREATE TABLE sku_doris1
   (
     sku_id int(11) NOT NULL
   ) ENGINE=OLAP
   DISTRIBUTED BY HASH(sku_id) BUCKETS 1
   PROPERTIES(
     "storage_type" = "COLUMN",
     "replication_num" = "1"
   );
   ```
   
   **sku_doris1表插入数据**
   
   ```sql
   insert into sku_doris1 (sku_id) values (100),(101),(102),(103);
   ```
   
   
   **doris表1:sku_doris2**
   
   ```sql
   CREATE TABLE sku_doris2
   (
     sku_id int(11) NOT NULL
   ) ENGINE=OLAP
   DISTRIBUTED BY HASH(sku_id) BUCKETS 1
   PROPERTIES(
     "storage_type" = "COLUMN",
     "replication_num" = "1"
   );
   ```
   
   **sku_doris2表插入数据**
   
   ```sql
   insert into sku_doris2 (sku_id) values (10000),(10001),(10002),(10003);
   ```
   
   查询语句
   
   ```sql
   select a.sku_id, c.price from sku_doris1 a left join
   (select sku_id, 999 as price from sku_doris2 b)c
   on a.sku_id=c.sku_id;
   ```
   
   **期待的结果为**
   |  sku_id   | price  |
   |  ----  | ----  |
   | 100  | NULL |
   | 101  | NULL |
   | 102  | NULL |
   | 103  | NULL |
   
   **期待的结果为**
   |  sku_id   | price  |
   |  ----  | ----  |
   | 100  | 999 |
   | 101  | 999 |
   | 102  | 999 |
   | 103  | 999 |
   
   **环境信息**
   * 版本:Doris version 0.12.21-release
   


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