doki23 opened a new issue #2041:
URL: https://github.com/apache/arrow-datafusion/issues/2041
Actually, it's not a functionality bug. It's my confusion about the unit
test: **logical_plan::builder::tests::plan_using_join_wildcard_projection**
The following is some code in the test.
```
let plan = LogicalPlanBuilder::scan_empty(Some("t1"), &employee_schema(),
None)?
.join_using(&t2, JoinType::Inner, vec!["id"])?
.project(vec![Expr::Wildcard])? // my question about here
.build()?;
```
I find some error descriptions in other places like:
```
Expr::Wildcard { .. } => Err(DataFusionError::Internal(
"Wildcard expressions are not valid in a logical query
plan".to_owned(),
))
```
And in the sql planner, we always expand the wildcard before generating a
logical plan.
So the unit test may be wrong, please correct me if I am wrong.
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