yjshen commented on code in PR #2242:
URL: https://github.com/apache/arrow-datafusion/pull/2242#discussion_r851361782
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datafusion/core/src/physical_plan/mod.rs:
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@@ -217,8 +218,9 @@ pub trait ExecutionPlan: Debug + Send + Sync {
fn children(&self) -> Vec<Arc<dyn ExecutionPlan>>;
/// Returns a new plan where all children were replaced by new plans.
+ /// The size of `children` must be equal to the size of
`ExecutionPlan::children()`.
Review Comment:
```suggestion
/// Returns a new plan where all children were replaced by new plans.
```
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