alamb commented on issue #13753:
URL: https://github.com/apache/datafusion/issues/13753#issuecomment-2541977343
> AFAIK Rust doesn't allow downcasting from a `dyn` object to a trait (i.e.
`Unparseable`) - it needs to be the concrete type.
I think it my example `unparseable` would be `&dyn Unparseable` 👍
```rust
let user_defined_local_node: dyn &UserDefinedLogicalNode = ...;
// is the user defined node unparseable?
let Some(unparseable) = user_defined_local_node. // <---- this is `&dyn
Unparseable` I think
.as_any()
.downcast_ref::<Unparseable>() else {
return plan_err!("Node type {} does not implement Unparseable",
user_defined_local_node.name())
}
let sql_nodes = unparseable.unparse(unparser, ....)
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