askoa opened a new issue, #4898:
URL: https://github.com/apache/arrow-datafusion/issues/4898
**Describe the bug**
The function used to trace LogicalPlan `LogicalPlan::display_indent()` does
not display subqueries when the enclosing `Expr` is wrapped in `Expr::Alias`.
Note: I'll pick this up.
**To Reproduce**
The below test will fail
```
#[test]
fn test_display_subquery_alias() -> Result<()> {
let plan1 = table_scan(Some("employee_csv"), &employee_schema(),
Some(vec![3]))?
.build()?;
let plan1 = Arc::new(plan1);
let plan = table_scan(Some("employee_csv"), &employee_schema(),
Some(vec![0, 3]))?
.project(vec![col("id"), exists(plan1).alias("exists")])?
.build();
let expected = "Projection: employee_csv.id, EXISTS (<subquery>) AS
exists\
\n Subquery:\
\n TableScan: employee_csv projection=[state]\
\n TableScan: employee_csv projection=[id, state]";
assert_eq!(expected, format!("{}", plan?.display_indent()));
Ok(())
}
```
**Expected behavior**
The subquery should be displayed in the output and the above test should
pass.
**Additional context**
The function `LogicalPlan::collect_subqueries` does not look for subqueries
in `Expr::Alias`.
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