AS Keyword added by default even if not specified on original SQL statement

Hi all,
I am writing you after @TylerBrinks suggested me to open a discussion on the issue mentioned in title.
Basically I am using the C# porting version of Rust one (thanks Tyler) using the Generic dialect in an Oracle
scenario. I know that is not the perfect usage but what happens is that when I parse a SQL statement that do not
have the AS clause specified the dialect automatically add it which causing Oracle error when trying to execute it.
I have tried to create a new dialect for Oracle but I didn't find a way (at least in the c# version) where to override
the default AS clause inserted. I proposed @TylerBrinks some changes to his porting code but he objected that was better to open a discussion here on this topic.
Please I am open to any solution like:
1- Write a new Oracle dialect class giving me the possibility to override the default AS clause
2- Remove default AS clause

Thanks in advance
Regards
Luigi

首先重现不带 AS 子句的语句在 Generic 方言中的解析过程，然后跟踪方言特定的别名渲染是在何处选择的。将 parser 生成的 SQL 与 Oracle 的要求进行比较，并确定采用 Oracle 方言还是可配置的 AS 行为更合适。当所选择的行为已得到覆盖，并且 Oracle 情况下不会输出不需要的 AS 子句时，即表示完成。

由索引模型根据 Issue 内容生成。