The name of a face is consisted of an operatorID, an inner ID and an array of references of its neighbor faces.
每一个面都使用了一个生成面的操作ID，一个操作内部分配的ID和一个邻接面表进行命名。
2
Go to this specific operatorID in the detailed operator section of the access plan, and isolate the predicates applied at the operator (in this case, IXSCAN). For example.
在访问计划的详细操作部分找到这个操作id，并隔离应用于该操作(即ixscan)的断言。
3
For each row ID, the FETCH operator reads the corresponding row from the table.