排序更改输出时的奇怪行为

Question

我想出了这个SQL语句：

SELECT   *
      FROM   (    SELECT   FID,
                           YEAR,
                           STATE,
                           CONNECT_BY_ISLEAF IS_LEAF
                    FROM   (SELECT   year YEAR,
                                     state STATE,
                                     id ID,
                                     foreign_id FID
                              FROM   yearsTable)
              CONNECT BY   (    PRIOR YEAR - 1 = YEAR
                            AND STATE = 'state2'
                            AND PRIOR FID = FID
                            AND LEVEL <= 2)
              START WITH   (    YEAR >= 2012 - 2
                            AND YEAR <= 2012 - 1
                            AND STATE = 'state1'))
CONNECT BY   (PRIOR YEAR - 1 = YEAR AND PRIOR FID = FID)
START WITH   (IS_LEAF = 0)
  ORDER BY   FID, YEAR ASC;

基本上搜索从上一年到下一年经历状态变化的所有年份。在本地测试机上工作正常，但在生产系统上中断。

我改变{{1在YEAR之后asc。

到目前为止，我刚刚使用Oracle SQL Developer对此进行了测试，数据库版本为10g。

有人可以解释为什么输出会根据排序方向而改变吗？