goldmedal opened a new issue, #12154:
URL: https://github.com/apache/datafusion/issues/12154
### Is your feature request related to a problem or challenge?
Consider the following case:
```rust
let ctx = SessionContext::new();
ctx.sql("create table t1 (a int, b int)").await?;
ctx.sql("insert into t1 values (1, 2), (3, 4)").await?;
let plan = ctx.sql(r#"select s1.a from (select s1.a, s1.b from (select
a, b from t1) s1) s1"#).await?.into_optimized_plan()?;
println!("optimized plan: {plan}");
let unparse = plan_to_sql(&plan)?.to_string();
println!("{}", format!("Unparsed SQL: {}", unparse));
```
The output result is
```
Optimized plan: SubqueryAlias: s1
SubqueryAlias: s1
TableScan: t1 projection=[a]
Unparsed SQL: SELECT * FROM t1 AS s1
```
The unparsing isn't equal to the original SQL. I think it should be
```
select * from (select a from t1) s1
```
### Describe the solution you'd like
Handle the pushdown projection at `Unparser:select_to_sql_recursively`
https://github.com/apache/datafusion/blob/23ccca9cd9bdf1791985f2b4abb6d5d8a4fc5ece/datafusion/sql/src/unparser/plan.rs#L240-L243
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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