minor cleanup

ballista/scheduler/src/scheduler_server/grpc.rs

@@ -18,9 +18,6 @@
 use axum::extract::ConnectInfo;
 use ballista_core::config::BALLISTA_JOB_NAME;
 use ballista_core::serde::protobuf::execute_query_params::{OptionalSessionId, Query};
-use ballista_core::utils::SessionConfigExt;
-use std::net::SocketAddr;
-
 use ballista_core::serde::protobuf::scheduler_grpc_server::SchedulerGrpc;
 use ballista_core::serde::protobuf::{
     execute_query_failure_result, execute_query_result, AvailableTaskSlots,
@@ -34,16 +31,17 @@ use ballista_core::serde::protobuf::{
     UpdateTaskStatusParams, UpdateTaskStatusResult,
 };
 use ballista_core::serde::scheduler::ExecutorMetadata;
+use ballista_core::utils::SessionConfigExt;
 use datafusion_proto::logical_plan::AsLogicalPlan;
 use datafusion_proto::physical_plan::AsExecutionPlan;
 use log::{debug, error, info, trace, warn};
+use std::net::SocketAddr;
 
 use std::ops::Deref;
 
 use crate::cluster::{bind_task_bias, bind_task_round_robin};
 use crate::config::TaskDistributionPolicy;
 use crate::scheduler_server::event::QueryStageSchedulerEvent;
-use datafusion::prelude::SessionContext;
 use std::time::{SystemTime, UNIX_EPOCH};
 use tonic::{Request, Response, Status};