EmmyMiao87 opened a new issue #1725: The null result of union stmt is incorrect URL: https://github.com/apache/incubator-doris/issues/1725 **Describe the bug** The null result of union stmt is incorrect when the child of union stmt is a outer join with the null-supplying column. **To Reproduce** mysql> CREATE TABLE `empty` ( -> `k1` tinyint(4) NOT NULL COMMENT "", -> `k2` tinyint(4) NOT NULL COMMENT "" -> ) ENGINE=OLAP -> AGGREGATE KEY(`k1`, `k2`) -> DISTRIBUTED BY HASH(`k1`) BUCKETS 5 -> PROPERTIES ( -> "storage_type" = "COLUMN", "replication_num" = "1" -> ); Query OK, 0 rows affected (0.19 sec) mysql> CREATE TABLE `left_table` ( -> `k1` tinyint(4) NOT NULL COMMENT "", -> `k2` tinyint(4) NOT NULL COMMENT "" -> ) ENGINE=OLAP -> AGGREGATE KEY(`k1`, `k2`) -> DISTRIBUTED BY HASH(`k1`) BUCKETS 5 -> PROPERTIES ( -> "storage_type" = "COLUMN", "replication_num" = "1" -> ); Query OK, 0 rows affected (0.07 sec) mysql> insert into left_table values (1,1); Query OK, 1 row affected (0.29 sec) mysql> (select k2 from empty) union (select b.k2 k2 from left_table a left join empty b on a.k1=b.k1); +------+ | k2 | +------+ | 0 | +------+ 1 row in set (0.09 sec) mysql> select b.k2 k2 from left_table a left join empty b on a.k1=b.k1; +------+ | k2 | +------+ | NULL | +------+ 1 row in set (0.07 sec) **Expected behavior** +------+ | k2 | +------+ | NULL | +------+ **Additional context** The NULL column must be produced by a outer join.
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