fix plan types

infra/src/types/plan/logical_plan.rs

@@ -12,8 +12,8 @@ use std::sync::Arc;
 /// The root of the plan DAG _cannot_ be a scalar operator (and thus for now can only be a logical
 /// operator).
 #[derive(Clone)]
-pub enum LogicalPlan {
-    LogicalRoot(Arc<LogicalOperator<LogicalLink>>),
+pub struct LogicalPlan {
+    root: Arc<LogicalOperator<LogicalLink>>,
 }
 
 /// A link in a [`LogicalPlan`] to a node.
@@ -26,9 +26,6 @@ pub enum LogicalPlan {
 ///
 /// - [`super::logical_plan::LogicalLink`] only allows a logical operator to have other logical
 ///   operators or scalar operators as children since that is all [`LogicalPlan`] needs
-/// - [`super::physical_plan::LogicalLink`] allows a logical operator to also have a physical
-///   operator as a child (since [`PhysicalPlan`] needs to encode both logical and physical
-///   operators).
 /// - [`super::partial_logical_plan::LogicalLink`] allows a logical operator to also have a
 ///   [`GroupId`] as a child (since the [`PartialLogicalPlan`] is a partially materialized query
 ///   plan).

infra/src/types/plan/physical_plan.rs

@@ -1,20 +1,12 @@
-use crate::types::operator::{logical::LogicalOperator, physical::PhysicalOperator, ScalarOperator};
+use crate::types::operator::{
+    logical::LogicalOperator, physical::PhysicalOperator, ScalarOperator,
+};
 use std::sync::Arc;
 
 /// TODO Add docs.
 #[derive(Clone)]
-pub enum PhysicalPlan {
-    LogicalRoot(LogicalLink),
-    PhysicalRoot(PhysicalLink),
-}
-
-/// TODO Add docs.
-#[allow(clippy::enum_variant_names)]
-#[derive(Clone)]
-pub enum LogicalLink {
-    LogicalNode(Arc<LogicalOperator<LogicalLink>>),
-    PhysicalNode(Arc<PhysicalOperator<PhysicalLink>>),
-    ScalarNode(Arc<ScalarOperator<ScalarLink>>),
+pub struct PhysicalPlan {
+    root: Arc<PhysicalOperator<PhysicalLink>>,
 }
 
 /// TODO Add docs.