[Bug]: ctxToWord is a bad function 

### Version

v4.0.1

### Which SQL?

Any Others

### SQL content

_No response_

### JavaScript/TypeScript code

_No response_

### What happened?

某些情况下，ctxToWord 方法无法表达实体的位置，比如
```sql
SELECT * FROM a
.b
.c;
```


### Relevant log output

_No response_