chore: remove unused code

src/common/query/src/physical_plan.rs

@@ -203,10 +203,6 @@ impl DfPhysicalPlan for DfPhysicalPlanAdapter {
         Ok(Box::pin(DfRecordBatchStreamAdapter::new(stream)))
     }
 
-    fn metrics(&self) -> Option<MetricsSet> {
-        self.0.metrics()
-    }
-
     fn statistics(&self) -> Statistics {
         Statistics::default()
     }