Re: [I] `SubqueryAlias`, `Values`, and/or `EmptyRelation` have incorrect schemas after replacing `Placeholder` values [datafusion]

["Jefffrey (via GitHub)" <gi...@apache.org>]

Jefffrey commented on issue #18102:
URL: https://github.com/apache/datafusion/issues/18102#issuecomment-3488932364

   > Possibly related is that placeholders cannot be aliased:
   > 
   > let ctx = SessionContext::new();
   > let df = ctx.sql("SELECT $1 AS one, $2 AS two").await.unwrap();
   > // called `Result::unwrap()` on an `Err` value: SchemaError(FieldNotFound { field: Column { relation: None, name: "one" }, valid_fields: [] }, Some(""))
   
   @dqkqd do you know if your PR #18286 will also fix this or should we raise a new issue for it? (I'm in favour of raising a new issue instead of adding more to the PR if it requires a separate fix)


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