thinkharderdev commented on a change in pull request #1924:
URL: https://github.com/apache/arrow-datafusion/pull/1924#discussion_r822547792



##########
File path: ballista/rust/scheduler/src/lib.rs
##########
@@ -116,30 +117,29 @@ pub struct SchedulerServer<T: 'static + AsLogicalPlan, U: 
'static + AsExecutionP
     pub(crate) state: Arc<SchedulerState<T, U>>,
     start_time: u128,
     policy: TaskSchedulingPolicy,
-    scheduler_env: Option<SchedulerEnv>,
+    scheduler_loop: Option<SchedulerLoop>,
     executors_client: Option<ExecutorsClient>,
-    ctx: Arc<RwLock<ExecutionContext>>,
     codec: BallistaCodec<T, U>,
+    /// DataFusion session contexts that are registered within the 
SchedulerServer
+    session_context_registry: Arc<SessionContextRegistry>,

Review comment:
       To add on to that slightly, previous work allows the serialization of 
extension plans in Ballista, but in order to actually use them an 
`ExtensionPlanner` needs to be registered in the `DefaultQueryPlanner`. 




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