comphead commented on issue #6543:
URL:
https://github.com/apache/arrow-datafusion/issues/6543#issuecomment-1633142650
> 🤯 I didn't realize this worked
>
> ```sql
> (arrow_dev) alamb@MacBook-Pro-8:~/Software/influxdb_iox2$ datafusion-cli
> DataFusion CLI v26.0.0
> ❯ create table foo (x int) as values (1), (2), (3);
> 0 rows in set. Query took 0.003 seconds.
> ❯ select x as "my_col", x as "my col" from foo;
> +--------+--------+
> | my_col | my col |
> +--------+--------+
> | 1 | 1 |
> | 2 | 2 |
> | 3 | 3 |
> +--------+--------+
> 3 rows in set. Query took 0.005 seconds.
> ❯ select x as "my_col", x+1 as "my col" from foo;
> +--------+--------+
> | my_col | my col |
> +--------+--------+
> | 1 | 2 |
> | 2 | 3 |
> | 3 | 4 |
> ```
>
> However, using `c1` as the alias for some reason fails:
>
> ```sql
> ❯ select x as c1, x as c1 from foo;
> Error during planning: Projections require unique expression names but the
expression "foo.x AS c1" at position 0 and "foo.x AS c1" at position 1 have the
same name. Consider aliasing ("AS") one of them.+--------+--------+
> ```
its failed as DF has projection uniqueness column name check.
first test didn't fail because it has different aliases
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