diff --git a/ballista/client/src/context.rs b/ballista/client/src/context.rs
index c4aef7de3..c48ed33e0 100644
--- a/ballista/client/src/context.rs
+++ b/ballista/client/src/context.rs
@@ -974,11 +974,11 @@ mod standalone_tests {
             .unwrap();
         let res = df.collect().await.unwrap();
         let expected = vec![
-            "+---------------------------------+",
-            "| COVAR(test.id,test.tinyint_col) |",
-            "+---------------------------------+",
-            "| 0.28571428571428586             |",
-            "+---------------------------------+",
+            "+--------------------------------------+",
+            "| covar_samp(test.id,test.tinyint_col) |",
+            "+--------------------------------------+",
+            "| 0.28571428571428586                  |",
+            "+--------------------------------------+",
         ];
         assert_result_eq(expected, &res);
     }
diff --git a/ballista/executor/src/execution_loop.rs b/ballista/executor/src/execution_loop.rs
index 339d8b2df..111120bd2 100644
--- a/ballista/executor/src/execution_loop.rs
+++ b/ballista/executor/src/execution_loop.rs
@@ -32,6 +32,9 @@ use ballista_core::error::BallistaError;
 use ballista_core::serde::scheduler::{ExecutorSpecification, PartitionId};
 use ballista_core::serde::BallistaCodec;
 use datafusion::execution::context::TaskContext;
+use datafusion::functions_aggregate::covariance::{covar_pop_udaf, covar_samp_udaf};
+use datafusion::functions_aggregate::sum::sum_udaf;
+use datafusion::functions_aggregate::variance::var_samp_udaf;
 use datafusion_proto::logical_plan::AsLogicalPlan;
 use datafusion_proto::physical_plan::AsExecutionPlan;
 use futures::FutureExt;
@@ -44,7 +47,6 @@ use std::ops::Deref;
 use std::sync::mpsc::{Receiver, Sender, TryRecvError};
 use std::time::{SystemTime, UNIX_EPOCH};
 use std::{sync::Arc, time::Duration};
-use datafusion::functions_aggregate::variance::var_samp_udaf;
 use tonic::transport::Channel;
 
 pub async fn poll_loop<T: 'static + AsLogicalPlan, U: 'static + AsExecutionPlan>(
@@ -117,7 +119,7 @@ pub async fn poll_loop<T: 'static + AsLogicalPlan, U: 'static + AsExecutionPlan>
                     {
                         Ok(_) => {}
                         Err(e) => {
-                            panic!("Failed to run task: {:?}", e);
+                            warn!("Failed to run task: {:?}", e);
                         }
                     }
                 }
@@ -190,7 +192,13 @@ async fn run_received_task<T: 'static + AsLogicalPlan, U: 'static + AsExecutionP
     for agg_func in executor.aggregate_functions.clone() {
         task_aggregate_functions.insert(agg_func.0, agg_func.1);
     }
+    // since DataFusion 38 some internal functions were converted to UDAF, so
+    // we have to register them manually
     task_aggregate_functions.insert("var".to_string(), var_samp_udaf());
+    task_aggregate_functions.insert("covar_samp".to_string(), covar_samp_udaf());
+    task_aggregate_functions.insert("covar_pop".to_string(), covar_pop_udaf());
+    task_aggregate_functions.insert("SUM".to_string(), sum_udaf());
+
     for window_func in executor.window_functions.clone() {
         task_window_functions.insert(window_func.0, window_func.1);
     }
diff --git a/ballista/scheduler/src/scheduler_server/mod.rs b/ballista/scheduler/src/scheduler_server/mod.rs
index 25fa4296b..e6525f188 100644
--- a/ballista/scheduler/src/scheduler_server/mod.rs
+++ b/ballista/scheduler/src/scheduler_server/mod.rs
@@ -342,7 +342,8 @@ mod test {
     use std::sync::Arc;
 
     use datafusion::arrow::datatypes::{DataType, Field, Schema};
-    use datafusion::logical_expr::{col, sum, LogicalPlan};
+    use datafusion::functions_aggregate::sum::sum;
+    use datafusion::logical_expr::{col, LogicalPlan};
 
     use datafusion::test_util::scan_empty;
     use datafusion_proto::protobuf::LogicalPlanNode;
diff --git a/ballista/scheduler/src/scheduler_server/query_stage_scheduler.rs b/ballista/scheduler/src/scheduler_server/query_stage_scheduler.rs
index 138f70900..df74ad6b2 100644
--- a/ballista/scheduler/src/scheduler_server/query_stage_scheduler.rs
+++ b/ballista/scheduler/src/scheduler_server/query_stage_scheduler.rs
@@ -354,7 +354,8 @@ mod tests {
     use ballista_core::config::TaskSchedulingPolicy;
     use ballista_core::error::Result;
     use datafusion::arrow::datatypes::{DataType, Field, Schema};
-    use datafusion::logical_expr::{col, sum, LogicalPlan};
+    use datafusion::functions_aggregate::sum::sum;
+    use datafusion::logical_expr::{col, LogicalPlan};
     use datafusion::test_util::scan_empty_with_partitions;
     use std::sync::Arc;
     use std::time::Duration;
diff --git a/ballista/scheduler/src/test_utils.rs b/ballista/scheduler/src/test_utils.rs
index f1253c929..59e6a875a 100644
--- a/ballista/scheduler/src/test_utils.rs
+++ b/ballista/scheduler/src/test_utils.rs
@@ -45,11 +45,12 @@ use datafusion::arrow::datatypes::{DataType, Field, Schema, SchemaRef};
 use datafusion::common::DataFusionError;
 use datafusion::datasource::{TableProvider, TableType};
 use datafusion::execution::context::{SessionConfig, SessionContext, SessionState};
+use datafusion::functions_aggregate::sum::sum;
 use datafusion::logical_expr::expr::Sort;
 use datafusion::logical_expr::{Expr, LogicalPlan};
 use datafusion::physical_plan::display::DisplayableExecutionPlan;
 use datafusion::physical_plan::ExecutionPlan;
-use datafusion::prelude::{col, count, sum, CsvReadOptions, JoinType};
+use datafusion::prelude::{col, count, CsvReadOptions, JoinType};
 use datafusion::test_util::scan_empty;
 
 use crate::cluster::BallistaCluster;