BiteTheDDDDt commented on PR #10214:
URL: https://github.com/apache/doris/pull/10214#issuecomment-1159916749
> >
>
> Yes, although numbers("5") can be rewrote to another sql use `table
function` , I still think we need `table-valued function` :
>
> 1. `table-valued function` sql is easier to write than rewriting SQL。
>
> 2. In addition to `numbers()` , we can implement more `table-valued
function` in the future which may can not be rewrote.
Hi, I think `table function` and `table-valued function` still can reuse a
lot of code.
1. We can add `Rewrite-Rule` to FE to automatically rewrite sql, then user
can just use `select number(5);` directly.
2. Compared with `TVF`, `TF` has one more input column as argument. But we
have some function like `explode_numbers` just ignore the input column.
We can think of this `TF` that ignores input as `TVF`. Similarly, if we want
to implement a new `TVF`, we can implement a `TF` that ignores input and let it
participate in `Rewrite-Rule`.
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