geoffreyclaude commented on code in PR #22559:
URL: https://github.com/apache/datafusion/pull/22559#discussion_r3312914303
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datafusion/physical-plan/src/execution_plan.rs:
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@@ -718,20 +738,32 @@ pub trait ExecutionPlan: Any + Debug + DisplayAs + Send +
Sync {
impl dyn ExecutionPlan {
/// Returns `true` if the plan is of type `T`.
///
+ /// If this plan provides a [`ExecutionPlan::downcast_delegate`], delegates
+ /// to it.
+ ///
/// Prefer this over `downcast_ref::<T>().is_some()`. Works correctly when
/// called on `Arc<dyn ExecutionPlan>` via auto-deref.
pub fn is<T: ExecutionPlan>(&self) -> bool {
- (self as &dyn Any).is::<T>()
+ match self.downcast_delegate() {
+ Some(delegate) => delegate.is::<T>(),
+ None => (self as &dyn Any).is::<T>(),
+ }
Review Comment:
> Should we revert the new `:Any` instead? I think it was just supposed to
be a cleanup but we didn't realize it would have downstream impacts 🤔
@alamb Honestly I prefer the new API with `downcast_delegate`: it's explicit
and clearer.
> Also I wonder if there is some way to avoid using as_any / delegating
logic at all ... But to do that we would have to remove all uses of as_any /
downcasting I suspect
That would be a pretty big breaking change as well, as the `is a` check is
quite widespread.
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