建议将SQL改写为达梦兼容的格式：
方案1、使用达梦的UNION ALL构造虚拟表：

SELECT '111' AS column_name FROM DUAL
UNION ALL
SELECT '222' FROM DUAL
UNION ALL
SELECT '333' FROM DUAL
UNION ALL
SELECT '444' FROM DUAL
UNION ALL
SELECT '555' FROM DUAL
UNION ALL
SELECT '666' FROM DUAL
UNION ALL
SELECT '777' FROM DUAL
UNION ALL
SELECT '999' FROM DUAL;

方案2、使用达梦的CONNECT BY语法

SELECT column_name
FROM (
    SELECT '111' AS column_name FROM DUAL
    UNION ALL SELECT '222' FROM DUAL
    UNION ALL SELECT '333' FROM DUAL
    UNION ALL SELECT '444' FROM DUAL
    UNION ALL SELECT '555' FROM DUAL
    UNION ALL SELECT '666' FROM DUAL
    UNION ALL SELECT '777' FROM DUAL
    UNION ALL SELECT '999' FROM DUAL
) t;

如果程序能修改，可以试着创建一个自定义嵌套类型对象，类似于

--创建对象
CREATE TYPE TP_VALUES IS TABLE OF VARCHAR2(32767);

--对象查询
SELECT COLUMN_VALUE AS COL_NAME
  FROM TABLE(TP_VALUES( '111', '222', '333', '444', '555', '666', '777', '999'));

测试结果是下面这样

这个写法在达梦和Oracle下是都支持的，但达梦目前需要外面套一层TABLE，要是Oracle19c里就可以直接可以查TP_VALUES，类似于

期望达梦早日也能实现这个功能