ORA-29908：缺少辅助运算符的主调用

我设法通过用另一个查询包围当前查询并将ORDER BY RANK拉到外部查询来解决该问题。像这样：

SELECt * FROM (SELECt 4*SCORE(1) + 2*SCORE(2) + SCORE(3) AS RANK      FROM   images i      WHERe  ConTAINS(i.subject, 'testing', 1)>0      OR  ConTAINS(i.place, 'testing', 2)>0      OR  ConTAINS(i.description, 'testing', 3)>0)ORDER BY RANK;