alexanderbianchi commented on code in PR #26603:
URL: https://github.com/apache/datafusion/pull/26603#discussion_r4413464964


##########
datafusion/substrait/src/logical_plan/consumer/rel/join_rel.rs:
##########
@@ -33,12 +36,20 @@ pub async fn from_join_rel(
         return not_impl_err!("JoinRel with post_join_filter is not yet 
supported");
     }
 
-    let left: LogicalPlanBuilder = LogicalPlanBuilder::from(
-        consumer.consume_rel(join.left.as_ref().unwrap()).await?,
-    );
-    let right = LogicalPlanBuilder::from(
-        consumer.consume_rel(join.right.as_ref().unwrap()).await?,
-    );
+    let (Some(left), Some(right)) = (join.left.as_deref(), 
join.right.as_deref()) else {
+        return substrait_err!("JoinRel requires left and right inputs");
+    };
+    let [left, right] = consumer
+        .consume_rel_inputs(&[left, right])

Review Comment:
   Lambda state:
   - [The RwLock and parameter 
stack](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L734-L744).
   - [Mutation through &self: acquire the write lock and push 
parameters](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L763-L792).
   - [The sequence spanning an await: push → consume body → 
pop](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/expr/lambda.rs#L35-L43).
   Correlated-subquery state:
   - [The outer_schemas 
lock](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L598-L602)
 and [push/pop mutations through 
&self](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L636-L642).
   - [The sequence spanning an await: push → consume subquery → 
pop](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/expr/subquery.rs#L35-L43).



##########
datafusion/substrait/src/logical_plan/consumer/rel/join_rel.rs:
##########
@@ -33,12 +36,20 @@ pub async fn from_join_rel(
         return not_impl_err!("JoinRel with post_join_filter is not yet 
supported");
     }
 
-    let left: LogicalPlanBuilder = LogicalPlanBuilder::from(
-        consumer.consume_rel(join.left.as_ref().unwrap()).await?,
-    );
-    let right = LogicalPlanBuilder::from(
-        consumer.consume_rel(join.right.as_ref().unwrap()).await?,
-    );
+    let (Some(left), Some(right)) = (join.left.as_deref(), 
join.right.as_deref()) else {
+        return substrait_err!("JoinRel requires left and right inputs");
+    };
+    let [left, right] = consumer
+        .consume_rel_inputs(&[left, right])

Review Comment:
   Lambda state:
   - [The RwLock and parameter 
stack](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L734-L744).
   - [Mutation through &self: acquire the write lock and push 
parameters](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L763-L792).
   - [The sequence spanning an await: push → consume body → 
pop](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/expr/lambda.rs#L35-L43).
   
   Correlated-subquery state:
   - [The outer_schemas 
lock](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L598-L602)
 and [push/pop mutations through 
&self](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/substrait_consumer.rs#L636-L642).
   - [The sequence spanning an await: push → consume subquery → 
pop](https://github.com/apache/datafusion/blob/ccbcea562b3c8112760e67ba8a65d237b2037e7c/datafusion/substrait/src/logical_plan/consumer/expr/subquery.rs#L35-L43).



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