diff --git a/planner/core/integration_test.go b/planner/core/integration_test.go
index 87e9390ad1..c0890093b0 100644
--- a/planner/core/integration_test.go
+++ b/planner/core/integration_test.go
@@ -6696,3 +6696,24 @@ func TestDecimalOverflow(t *testing.T) {
 	tk.MustExec("insert into deci values (1234567890.123456789012345678901234567890,987654321098765432109876543210987654321098765432109876543210)")
 	tk.MustQuery("select a from deci union ALL select b from deci;").Sort().Check(testkit.Rows("1234567890.123456789012345678901234567890", "99999999999999999999999999999999999.999999999999999999999999999999"))
 }
+
+func TestIssue35083(t *testing.T) {
+	defer func() {
+		variable.SetSysVar(variable.TiDBOptProjectionPushDown, variable.BoolToOnOff(config.GetGlobalConfig().Performance.ProjectionPushDown))
+	}()
+	defer config.RestoreFunc()()
+	config.UpdateGlobal(func(conf *config.Config) {
+		conf.Performance.ProjectionPushDown = true
+	})
+	variable.SetSysVar(variable.TiDBOptProjectionPushDown, variable.BoolToOnOff(config.GetGlobalConfig().Performance.ProjectionPushDown))
+	store, clean := testkit.CreateMockStore(t)
+	defer clean()
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec("create table t1 (a varchar(100), b int)")
+	tk.MustQuery("select @@tidb_opt_projection_push_down").Check(testkit.Rows("1"))
+	tk.MustQuery("explain format = 'brief' select cast(a as datetime) from t1").Check(testkit.Rows(
+		"TableReader 10000.00 root  data:Projection",
+		"└─Projection 10000.00 cop[tikv]  cast(test.t1.a, datetime BINARY)->Column#4",
+		"  └─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo"))
+}
diff --git a/sessionctx/variable/sysvar.go b/sessionctx/variable/sysvar.go
index e2a3656874..3605e94625 100644
--- a/sessionctx/variable/sysvar.go
+++ b/sessionctx/variable/sysvar.go
@@ -140,11 +140,11 @@ var defaultSysVars = []*SysVar{
 		}
 		return nil
 	}},
-	{Scope: ScopeSession, Name: TiDBOptProjectionPushDown, Value: BoolToOnOff(config.GetGlobalConfig().Performance.ProjectionPushDown), skipInit: true, Type: TypeBool, SetSession: func(s *SessionVars, val string) error {
+	{Scope: ScopeSession, Name: TiDBOptProjectionPushDown, Value: BoolToOnOff(config.GetGlobalConfig().Performance.ProjectionPushDown), Type: TypeBool, SetSession: func(s *SessionVars, val string) error {
 		s.AllowProjectionPushDown = TiDBOptOn(val)
 		return nil
 	}},
-	{Scope: ScopeSession, Name: TiDBOptAggPushDown, Value: BoolToOnOff(DefOptAggPushDown), Type: TypeBool, skipInit: true, SetSession: func(s *SessionVars, val string) error {
+	{Scope: ScopeSession, Name: TiDBOptAggPushDown, Value: BoolToOnOff(DefOptAggPushDown), Type: TypeBool, SetSession: func(s *SessionVars, val string) error {
 		s.AllowAggPushDown = TiDBOptOn(val)
 		return nil
 	}},