如果优化程序检测到在查询执行过程中可能会出现内存不足的情况，它将避免使用非重复散列算法生成访问计划。
The optimizer avoids generating access plans using the hash distinct algorithm if it detects that a low memory situation may occur during query execution.
通常，非递归算法要保存返回地址，使程序能继续正确执行。
Usually, return address must be saved for continuing a right execution of the program in no recursion version.
应用推荐