Fix clippy error

Author: kosiew

datafusion/physical-plan/src/joins/hash_join/exec.rs

@@ -1136,15 +1136,15 @@ impl ExecutionPlan for HashJoinExec {
 
     fn handle_child_pushdown_result(
         &self,
-        _phase: FilterPushdownPhase,
+        phase: FilterPushdownPhase,
         child_pushdown_result: ChildPushdownResult,
-        _config: &ConfigOptions,
+        config: &ConfigOptions,
     ) -> Result<FilterPushdownPropagation<Arc<dyn ExecutionPlan>>> {
         let df_side = self.join_type.dynamic_filter_side();
         self.handle_child_pushdown_result_with_side(
-            _phase,
+            phase,
             child_pushdown_result,
-            _config,
+            config,
             df_side,
         )
     }