[GitHub] [arrow] alamb commented on a change in pull request #8020: ARROW-9821: [Rust][DataFusion] Prototype design for UserDefined Logical Plan Nodes NOT FOR MERGING

[GitBox <gi...@apache.org>]

alamb commented on a change in pull request #8020:
URL: https://github.com/apache/arrow/pull/8020#discussion_r474978077



##########
File path: rust/datafusion/src/lp.rs
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@@ -0,0 +1,89 @@
+//! Prototype LogicalPlanNode interface for defining extensions for LogicalPlan nodes
+
+use crate::error::Result;
+use crate::{
+    execution::{context::ExecutionContextState, physical_plan::ExecutionPlan},
+    logicalplan::{Expr, LogicalPlan},
+};
+use arrow::datatypes::Schema;
+use core::fmt;
+use std::{
+    collections::HashSet,
+    sync::{Arc, Mutex},
+};
+
+/// This defines the interface for (currently user defined)
+/// LogicalPLan nodes that can be used to extend the logic
+pub trait LogicalPlanNode {

Review comment:
       This is the proposed trait that all LogicalPlan nodes would implement




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