diff --git a/pkg/planner/core/physical_plans.go b/pkg/planner/core/physical_plans.go
index 2c44983929756..c129933848881 100644
--- a/pkg/planner/core/physical_plans.go
+++ b/pkg/planner/core/physical_plans.go
@@ -940,8 +940,6 @@ type PhysicalTableScan struct {
 	// ByItems only for partition table with orderBy + pushedLimit
 	ByItems []*util.ByItems
 
-	isChildOfIndexLookUp bool
-
 	PlanPartInfo *PhysPlanPartInfo
 
 	SampleInfo *tablesampler.TableSampleInfo `plan-cache-clone:"must-nil"`