simonvandel opened a new issue, #8819:
URL: https://github.com/apache/arrow-datafusion/issues/8819
### Describe the bug
Optimizing a `LogicalPlan` with a placeholder fails with the error:
"Placeholder type could not be resolved".
### To Reproduce
```rust
#[tokio::test]
async fn fails() {
let ctx = SessionContext::new();
let df = ctx
.read_empty()
.unwrap()
.with_column("a", lit(1))
.unwrap()
.filter(col("a").eq(placeholder(":0")))
.unwrap();
let logical_plan = df.logical_plan();
// Fails with: Placeholder type could not be resolved
ctx.state().optimize(logical_plan).unwrap();
}
```
### Expected behavior
The optimizer does not fail at the placeholder, but optimizes as much as it
can with the info it has.
### Additional context
_No response_
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