fix fmt.

datafusion/physical-plan/src/aggregates/row_hash.rs

@@ -1008,7 +1008,9 @@ impl GroupedHashAggregateStream {
             // And it is not supported if stream has any spills even in Partial aggregation.
             // Although currently spilling is actually not supported in Partial aggregation,
             // it is possible to be supported in future, so we also add an assertion for it.
-            assert!(self.mode == AggregateMode::Partial && self.spill_state.spills.is_empty());
+            assert!(
+                self.mode == AggregateMode::Partial && self.spill_state.spills.is_empty()
+            );
             probe.update_state(input_rows, self.group_values.len());
         };
     }