fix(executor): fix broken query profiling graph (databendlabs#14183)

* fix(executor): fix broken query profiling graph

* fix(executor): fix broken query profiling graph

src/query/service/src/pipelines/pipeline_builder.rs

@@ -21,6 +21,7 @@ use databend_common_expression::DataField;
 use databend_common_expression::FunctionContext;
 use databend_common_pipeline_core::Pipeline;
 use databend_common_pipeline_core::PlanScope;
+use databend_common_pipeline_core::PlanScopeGuard;
 use databend_common_profile::SharedProcessorProfiles;
 use databend_common_settings::Settings;
 use databend_common_sql::executor::PhysicalPlan;
@@ -101,9 +102,18 @@ impl PipelineBuilder {
         })
     }
 
+    pub(crate) fn add_plan_scope(&mut self, plan: &PhysicalPlan) -> Option<PlanScopeGuard> {
+        match plan {
+            PhysicalPlan::EvalScalar(v) if v.exprs.is_empty() => None,
+            _ => {
+                let scope = PlanScope::create(plan.get_id(), plan.name());
+                Some(self.main_pipeline.add_plan_scope(scope))
+            }
+        }
+    }
+
     pub(crate) fn build_pipeline(&mut self, plan: &PhysicalPlan) -> Result<()> {
-        let scope = PlanScope::create(plan.get_id(), plan.name());
-        let _guard = self.main_pipeline.add_plan_scope(scope);
+        let _guard = self.add_plan_scope(plan);
         match plan {
             PhysicalPlan::TableScan(scan) => self.build_table_scan(scan),
             PhysicalPlan::CteScan(scan) => self.build_cte_scan(scan),