Parser fails when using alias named "TOP" in SELECT statement

Reproducer: Using datafusion-cli https://github.com/apache/datafusion/tree/main/datafusion-cli compiled from hash 5bbdb7eb1

```
> WITH t AS (SELECT 1 AS val) SELECT tt.val FROM t AS tt;
+-----+
| val |
+-----+
| 1 |
+-----+
1 row(s) fetched.
Elapsed 0.050 seconds.

> WITH t AS (SELECT 1 AS val) SELECT top.val FROM t AS top; 🤔 Invalid statement: SQL error: ParserError("Expected: literal int, found: . at Line: 1, Column: 39")
```

Found by SQLStorm https://github.com/apache/datafusion/issues/17698

使用从 hash 5bbdb7eb1 构建的 datafusion-cli 重现该故障，并比较正常工作的别名 tt 与失败的别名 top。跟踪 SQL 解析器对 SELECT 别名中 TOP 的处理，并验证使用 top.val 的查询能够完成解析并返回预期的行。

由索引模型根据 Issue 内容生成。