alamb commented on a change in pull request #9342:
URL: https://github.com/apache/arrow/pull/9342#discussion_r565655349
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File path: rust/datafusion/src/physical_plan/planner.rs
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@@ -50,29 +50,30 @@ use arrow::compute::SortOptions;
use arrow::datatypes::{Schema, SchemaRef};
use expressions::col;
-/// This trait permits the `DefaultPhysicalPlanner` to create plans for
-/// user defined `ExtensionPlanNode`s
+/// This trait exposes the ability to plan an [`ExecutionPlan`] out of a
[`LogicalPlan`].
pub trait ExtensionPlanner {
- /// Create a physical plan for an extension node
+ /// Create a physical plan for a [`UserDefinedLogicalNode`].
+ /// This errors when the planner knows how to plan the concrete
implementation of `node`
+ /// but errors while doing so, and `None` when the planner does not know
how to plan the `node`
+ /// and wants to delegate the planning to another [`ExtensionPlanner`].
Review comment:
This is a nice interface
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